How to reproduce:
1. Open the attached “IN-139898” project
2. Drag Hierarchy Title Bar over the Inspector Title Bar without unclicking it
3. Drag the Hierarchy Title Bar back and unclick
4. Observe the Inspector Title Bar

Actual result: Inspector Title Bar gets stuck until you move the mouse over the Inspector Window
Expected result: Inspector Title Bar doesn’t get stuck

Reproducible with: 2023.1.0a1, 6000.0.73f1, 6000.3.13f1, 6000.4.3f1, 6000.5.0b4, 6000.6.0a3

Reproducible on: Windows 10 (by user), Windows 11
Not reproducible on: No other environments tested

Note: This happens with other Title Bars too, Hierarchy and Inspector is used for an example