Release appearance
macOS 26.4 Beta 1
Recorded context
About this appearance
The first retained raw Apple DocC state after macOS Tahoe 26.4 Beta 1 and before Beta 2 documents 18 distinct API, compatibility, resolved-issue, and known-issue entries.
- Date
- Feb 16, 2026
- Availability
- available
- Revision
- No
Release notes
What changed
Original editorial synthesis. Linked references appear with the claims they support and in the source ledger.
Archived Apple note state
Apple's human documentation shell was archived on the Beta 1 date, and its raw DocC payload was captured the following day, before Beta 2. The payload identifies itself as macOS Tahoe 26.4 Beta Release Notes and contains 18 structured items represented here.[1]
Documented Beta 1 inventory
The initial state spans AppKit, Background Assets, CoreMIDI, external boot and media, Exchange accounts, login and Recovery, networking, resource forks, Rosetta, StoreKit, SwiftUI, and virtualization. Known issues remain labeled separately from fixes and new capabilities.[1]
Attribution boundary
This is an observed initial snapshot state rather than a claim that every item appeared at the exact release hour. Because the raw payload follows Beta 1 and precedes Beta 2, no later milestone is crossed and no final-note material is projected backward.[1]
Source ledger
References
Sources are linked to the claims they support. Publication and access dates are shown when available.
- Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot
Apple Developer · 2026-07-30 · Human DocC capture 20260216203520; companion raw payload 20260217150536; macOS Tahoe 26.4 Beta Release Notes
- Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot
Apple Developer · 2026-07-30 · AppKit — Resolved Issues; issue 149726089
- Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot
Apple Developer · 2026-07-30 · Background Assets — Known Issues; issue 169558509
- Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot
Apple Developer · 2026-07-30 · Background Assets — Known Issues; issue 169648111
- Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot
Apple Developer · 2026-07-30 · Background Assets — New Features; issues 164498466 and 166237389
- Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot
Apple Developer · 2026-07-30 · CoreMIDI — New Features; issue 118728162
- Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot
Apple Developer · 2026-07-30 · External Boot — Known Issues; issue 170263142
- Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot
Apple Developer · 2026-07-30 · External Media — Known Issues; issue 168672160
- Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot
Apple Developer · 2026-07-30 · Internet Accounts — Known Issues; issue 168082477
- Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot
Apple Developer · 2026-07-30 · Login — Known Issues; issue 169743642
- Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot
Apple Developer · 2026-07-30 · macOS Recovery — Known Issues; issue 170280070
- Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot
Apple Developer · 2026-07-30 · Networking — Resolved Issues; issues 166839810 and FB21376045
- Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot
Apple Developer · 2026-07-30 · Resource fork — Resolved Issues; issue 156896699
- Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot
Apple Developer · 2026-07-30 · Rosetta — Deprecations; issue 169228455
- Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot
Apple Developer · 2026-07-30 · StoreKit — New Features; issue 148858551
- Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot
Apple Developer · 2026-07-30 · SwiftUI — Known Issues; issue 169723142
- Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot
Apple Developer · 2026-07-30 · SwiftUI — Resolved Issues; issue 163136831
- Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot
Apple Developer · 2026-07-30 · SwiftUI — Resolved Issues; issues 166828089 and FB21375029
- Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot
Apple Developer · 2026-07-30 · Virtualization — Resolved Issues; issue 169654019
Release changes
Changed in this release
Features, fixes, removals, and regressions first observed in this release record.
bugFix · fixed
PAC configuration run-loop source leak fix
The beta note documents corrected ownership behavior around proxy auto-configuration callbacks and their returned Core Foundation objects.
- [1] Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot · Networking — Resolved Issues; issues 166839810 and FB21376045
bugFix · fixed
SwiftUI current user-activity fix
The archived beta note marks SwiftUI's stale current-user-activity behavior as resolved.
- [1] Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot · SwiftUI — Resolved Issues; issue 163136831
knownIssue · knownIssue
Standard-user Touch ID unlock known issue
The initial beta note says an administrator should sign in first to avoid the documented standard-account unlock state.
- [1] Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot · Login — Known Issues; issue 169743642
developerApi · introduced
Network MIDI 2.0 support
The initial beta note introduces Network MIDI 2.0 sessions, local-network discovery, and UDP transport for Universal MIDI Packets.
- [1] Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot · CoreMIDI — New Features; issue 118728162
compatibility · changed
Rosetta retirement compatibility notice
The beta began accelerated compatibility notices for applications that depend on Rosetta, ahead of the previously announced support transition.
- [1] Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot · Rosetta — Deprecations; issue 169228455
knownIssue · knownIssue
Background Assets download-crash known issue
The beta note warns that an asset-pack download could crash the application and provides relaunch guidance.
- [1] Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot · Background Assets — Known Issues; issue 169648111
bugFix · fixed
AppKit window-resize pointer fix
The initial macOS beta note marks the mismatch between the resize pointer and the window-corner shape as resolved.
- [1] Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot · AppKit — Resolved Issues; issue 149726089
knownIssue · knownIssue
M1 external-boot panic known issue
Apple documents an external-disk boot panic on some M1 configurations and recommends a secondary APFS volume for testing.
- [1] Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot · External Boot — Known Issues; issue 170263142
knownIssue · knownIssue
Background Assets URL-override known issue
Apple's beta note warns developers to remove an existing URL override before installing or using affected App Store applications.
- [1] Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot · Background Assets — Known Issues; issue 169558509
developerApi · introduced
Offline Background Assets inspection and refresh APIs
The initial macOS beta note documents offline status queries and an API for ensuring that the latest asset-pack version is available locally.
- [1] Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot · Background Assets — New Features; issues 164498466 and 166237389
knownIssue · knownIssue
SwiftUI RealityKit animation-grouping limitation
Apple documents that overlapping implicit animations can remain independent and overwrite a property when their targeted component-property sets differ.
- [1] Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot · SwiftUI — Known Issues; issue 169723142
developerApi · introduced
StoreKit transaction revocation fields
The initial beta note adds two revocation-related properties to StoreKit transaction data.
- [1] Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot · StoreKit — New Features; issue 148858551
knownIssue · knownIssue
Recovery Activation Lock erase known issue
Apple directs testers to use Erase All Content and Settings from the running system instead of the affected Recovery workflow.
- [1] Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot · macOS Recovery — Known Issues; issue 170280070
compatibility · changed
Resource-fork partial-write restriction
The initial beta note describes the supported replacement or beyond-offset write patterns for the com.apple.ResourceFork attribute.
- [1] Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot · Resource fork — Resolved Issues; issue 156896699
knownIssue · knownIssue
External HFS automount known issue
The macOS beta note records an automatic-mount failure and gives diskutil mount as a temporary workaround.
- [1] Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot · External Media — Known Issues; issue 168672160
knownIssue · knownIssue
Exchange account synchronization known issue
Apple documents failed Exchange synchronization and suggests disabling Notes sync to keep Calendar and Reminders updating.
- [1] Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot · Internet Accounts — Known Issues; issue 168082477
bugFix · fixed
Inactive-window glass backdrop fix
The beta note marks backdrop updates behind glass content in inactive non-opaque windows as corrected.
- [1] Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot · SwiftUI — Resolved Issues; issues 166828089 and FB21375029
bugFix · fixed
Virtual-machine installation display fix
The initial beta note marks a black screen during new macOS Tahoe virtual-machine installation as resolved on affected hardware.
- [1] Archived macOS Tahoe 26.4 Beta Release Notes — February 16 snapshot · Virtualization — Resolved Issues; issue 169654019