GLB Mesh generation fails when primitives in the same mesh mix UNSIGNED_SHORT and UNSIGNED_INT index formats

How to reproduce:
1. Open the attached “IN-139770“ project
2. Open the “New Scene“ scene
3. Enter Play mode
4. Observe the Console

Actual result: Invalid index format error appears
Expected result: Invalid index format error does not appear

Reproducible with: 6.16.1 (6000.3.14f1), 6.18.0 (6000.3.14f1, 6000.6.0a3)
Not reproducible with: 6.10.0 (6000.4.0b2), 6.16.0 (6000.3.14f1)

Reproducible on: Windows 11
Not reproducible on: No other environments tested

Notes:

• Issue reproduces in the Player
• Bug Reproduction project includes a synthetic GLB file, which does not render properly, but reproduces the issue successfully