How to reproduce:
1. Create a new project
2. Install the “com.unity.cloud.gltfast” package
3. Select File > Build And Run (Ctrl+B)
4. Observe result

Expected result: Build is successful
Actual result: Build fails

Reproducible with: 6.12.0(2021.3.51f1, 2022.3.61f1, 6000.0.47f1, 6000.1.0b15, 6000.2.0a9)
Not reproducible with: 6.11.0(2021.3.51f1, 2022.3.61f1, 6000.0.47f1, 6000.1.0b15, 6000.2.0a9)
Fixed in: 6.12.1(2021.3.51f1, 2022.3.61f1, 6000.0.47f1, 6000.1.0b15, 6000.2.0a9)

Reproducible on: macOS 15.4 (M1 Max), Windows 11 (by user)
Not reproducible on: no other environments tested

Notes:
- In 2021.3.51f1, 2022.3.61f1 with package version 6.12.0 a Compilation error is present: “Library/PackageCache/com.unity.cloud.gltfast@6.12.0/Runtime/Scripts/Animation/AnimationPlayableComponent.cs(5,7): error CS0246: The type or namespace name 'NUnit' could not be found (are you missing a using directive or an assembly reference?)” preventing Build and Play mode