ALL .ts4script files show "corrupted" on Mac ARM - even after full reinstall

After patch 1.121 (Feb 3, 2026), no .ts4script file can load on Mac ARM (Apple Silicon).

Error: "Cannot start because the below file appears to be corrupted" Code: [60c399f9:29f00e76:00000000:4b0d852b]

System: MacBook Pro M3 Pro, macOS 15.5

Game version: 1.121.361.1220

Tested:

 - Official S4CL v3.19 .ts4script - FAILS

 - Minimal 1-command test script - FAILS

 - Multiple ZIP compression methods - ALL FAIL

 - Game repair - didn't fix

 - Full uninstall + reinstall - didn't fix

 - Deleted localthumbcache.package - didn't fix

 - Deleted GameVersion.txt - didn't fix

 - Feb 12 hotfix applied - didn't fix

The error code is identical for EVERY .ts4script file, confirming this is a game-level validation bug, not file corruption. Game works fine with an empty Mods folder. No script mods can be used at all on Mac ARM.