Steps to reproduce:

Open the attached project
Open the Console window and clear it
Select "PB-4 > 1. Set all three settings to 42 (not saved)" from the menu bar
Observe the Console: "second=NONE" in the MonoScript list
Select "PB-4 > 2. Import a new texture out of process" from the menu bar
Observe the values the Import Worker used, in the Console or in the "observed" sub-asset of the new texture in Assets/ReproTextures

Actual results: The Import Worker reads "ReproSecondSettings.value" as 0 (the default) instead of 42, while the other two settings are synchronized. No warning or error is logged in the Console or in the Import Worker logs making it difficult to trace back to the cause.

Expected results: "ReproSecondSettings.value" is 42 on the Import Worker, or a warning is logged that the settings type cannot be synchronized because it has no MonoScript.

Reproducible with versions: 6000.7.0b1, 6000.7.0b2, 7000.0.0a1

Can’t test with versions: 6000.0.79f1, 6000.6.3f1, 6000.7.0a6 (the ImporterGlobalSettings API is not available)

Tested on (OS): macOS 26.6.2 (Apple Silicon)

Notes:

Root cause (two classes in one file, so only the first gets a MonoScript), a control class that syncs correctly in the same import
Workaround (one class per file, named after it)