Multiple NullReferenceExceptions are being thrown on TMPro.TMP_MaterialManager.GetFallbackMaterial when adding a new fallback font in the Player

Reproduction steps:
1. Open the attached “IN-110524“ project
2. Build and Run the Player
3. Close the Player and run it again (to get access to the “Change Language” option)
4. In the Player, click on the “Settings” button
5. Click the “Change Language” button
6. Select “Chinese” language
7. Observe the NullReferenceExceptions

Expected result: The fallback font gets added, downloaded, and text in the Player becomes in Chinese
Actual result: Multiple NullReferenceExceptions are thrown and all menu text disappears

Reproducible with: 6000.0.0b11, 6000.0.56f1, 6000.1.16f1, 6000.2.1f1, 6000.3.0a5
Not reproducible with: 2022.3.65f1
Couldn’t test with: 2023.2.0a14, 2023.3.0b1 (multiple different gradle build errors)

Reproducible environments: Windows 11 Standalone Player, Android platform
Not reproducible environments: No other environments tested

Reproducible with these devices:
VLNQA00403 - Galaxy Z Flip3 5G (SM-F711B), CPU: Snapdragon 888, GPU: Adreno 660, OS: 11

Note: Not reproducible in the Editor