How to reproduce:
1. Open the “Empty.zip“ project
2. Open the “Scene” Scene
3. Select “Notes” in the Hierarchy
4. Observe the Inspector

Expected result: Nothing is rendered out of the ordinary
Actual result: There is “Notes“ at the top left corner of the “Notes“ Component

Reproducible in: 6000.0.16f1, 6000.0.55f1, 6000.2.0f1, 6000.3.0a4
Not reproducible in: 6000.0.15f1

Reproduced on: Windows 11 Pro (24H2)
Not reproduced on: No other environment tested

Notes:
- The bug reproduces even when the CustomEditor class has content
- If the last variable is not a [TextArea] string, the bug will not reproduce
- Might be related to the “Multi-object editing not supported” info in the inspector (though in the script there is the [CanEditMultipleObjects] attribute)