Reproduction steps:
1. Create a Canvas gameobject in the Hierarchy: Create -> UI -> Canvas

2. Drag the Canvas to the Project to create a Prefab

3. In the Inspector of the Canvas Prefab set PosX to a non-zero value: E.g 150

4. Now right click on the Canvas Prefab and select Create > Prefab Variant

Expected results: No errors shown in the Console
Actual results: Console shows the error: "Assertion failed on expression: 'modifications.empty()'"

Reproducible on: Windows 11 Pro
Not reproducible on: No other environments tested