"Unable to generate text. Failed to load font..." errors spammed and Hierarchy GameObject names go blank when resetting Editor layout with Font Asset Generator window open

Steps to reproduce:

1. Create a new 3D UPR project
2. Go to Window > Text  > Font Asset Generator
3. Dock the window anywhere (although usually not necessary to dock)
4. In the Editor Toolbar go to Default > Default (to reset layout)
5. Observe the Console and Hierarchy once reset

Actual results: "Unable to generate text. Failed to load font 'Inter' (style: 'Regular'). The font face could not be initialized." errors are spammed and GameObjects in Hierarchy have empty name fields

Expected results: No errors or visual artifacts 

Reproducible with versions: 6000.5.0a8-6000.5.0b2 (Editor crashes after 4th step), 6000.5.0b3 (no more crashing, but errors remain), 6000.5.0b12, 6000.6.0a7

Not reproducible with versions: 6000.5.0a7

Tested on (OS): Windows 11, macOS 26.5

Notes:

• On Windows the errors also cause the Hierarchy to stop showing GameObject names and sometimes crashes when then resetting layout again, but on macOS no crashing or disappearing names are observed
• Reproduces with other Editor fonts too, not just with 'Inter'
• Hierarchy names disappear only if the Hierarchy v2 is used, with the old hierarchy only the errors are present
• Also reproduces with TMP Font Generator