How to reproduce:
1. Open the attached project "Reorder"
2. Open the "Test" scene
3. In the Hierarchy, select the "GameObject (2)"
4. In the Inspector, expand the "My Items" list under "My List Script"
5. Grab the "Element 2" and move it slightly up
6. Observe the results
Expected results: "Element 3" doesn't jump up
Actual results: "Element 3" jumps up
Reproducible with: 6000.3.12f1, 6000.4.2f1, 6000.5.0b2, 6000.6.0a3
Can't test with: 6000.0.71f1 (Scripts not loading)
Reproducible on: macOS Tahoe 26 (M1)
Not reproducible on: No other environment tested
Notes:
- IMGUI reordable list doesn't have this behaviour
- Affects all Editor tabs