[Issue] Develop Visual Icon does not appear in Desktop

Summary:
After enabling Develop a visual under File > Options > Current File > Report Settings, the setting resets after every restart of Power BI Desktop, and the </> developer visual icon never appears in the Visualizations pane.

Steps to Reproduce:

1. Open Power BI Desktop (June 2025 version)
2. Go to Options > Current File > Report Settings
3. Enable Develop a visual
4. Save the .pbix file
5. Close and reopen Power BI
6. Setting is now disabled again
7. Developer icon never appears

Expected Behavior:
The setting should persist per file, and the developer visual icon should be available.

Actual Behavior:
The setting resets on every session. No developer icon is shown. No error messages appear.

Environment:
Power BI Desktop Version: 2.144.1378.0 64-bit (June 2025) (latest)
Platform: Windows 10
pbiviz version: 6.1.3

Custom visual dev server works via pbiviz start