Steps to reproduce:
1. Create new Unity project using Universal 3D Template
2. Open Project Settings → Player → Other Settings → Scripting Define Symbols
3. Add ENABLE_UPSCALER_FRAMEWORK, press Apply and let Editor recompile
4. Select PC_RPAsset.asset in Project window, change Scaling Mode = Upscaling, Render Scale = 0.9
5. Select Mobile_RPAsset in Project window, change Scaling Mode = Upscaling, Render Scale = 0.5
6. In the Project window select both assets together (PC_RPAsset and then Mobile_RPAsset)
7. Click on Mobile_RPAsset and observe Render Scale value
Actual results: Mobile_RPAsset's Render Scale changes from 0.9 to 0.5, to the first-selected asset's value
Expected results: Each Asset keeps its own Render Scale. Selecting objects is not an edit, and every other differing property in the same drawer behaves this way
Reproducible with versions: 6000.7.0b1, 7000.0.0a1
Can’t test with versions: 6000.0.84f1, 6000.3.24f1, 6000.5.11f1, 6000.6.2f1, 6000.7.0a6 (Feature doesn’t exist)
Tested on (OS): macOS 26.6.1 (Apple silicon)