How to reproduce:
1. Open the attached “IN-122917“ project
2. Build for iOS
3. Open the “Unity-iPhone.xcodeproj“ file in Xcode
4. Build to a device
5. Observe the app

Actual result: The iOS app freezes
Expected result: The iOS app does not freeze

Reproducible with: 6000.2.0a6, 6000.3.3f1, 6000.4.0b1, 6000.5.0a1
Not reproducible with: 6000.0.65f1, 6000.2.0a5, 6000.4.0b3

Reproducible on: macOS 15.3.2 (24D81) (M1 Max)
Not reproducible on: No other environment tested

Reproducible with these devices:
VLNQA00626, iPhone 16 (MYE73QN/A), CPU: Apple A18 Pro, OS: 18.6.2
VLNQA00535, iPhone XS (MT9F2ET/A), CPU: Apple A12 Bionic, OS: 17.6.1

Not reproducible with these devices:
VLNQA00491, iPhone 14 Pro (MQ083PX/A), CPU: Apple A16 Bionic, OS: 16.0
VLNQA00600, iPad Pro (9.7 inch, WiFi) (MLMY2B/A), CPU: Apple A9X, OS: 14.8

Notes:

• Xcode crash first few lines of Stack Trace:

frame #0: 0x00000001e87d41dc libsystem_kernel.dylib`__pthread_kill + 8
frame #1: 0x0000000221e1bc60 libsystem_pthread.dylib`pthread_kill + 268
frame #2: 0x000000019f9b60ac libsystem_c.dylib`abort + 124
frame #3: 0x000000019f9b5548 libsystem_c.dylib`__assert_rtn + 284
frame #4: 0x0000000197651708 Metal`MTLReportFailure.cold.1 + 48
frame #5: 0x00000001975209a8 Metal`MTLReportFailure + 576

• Discussions thread: [https://discussions.unity.com/t/when-building-for-ios-from-unity-6-2-8-and-checking-if-dxt1-is-supported-the-system-function-returns-true/1692661]