Steps to reproduce:

1. Create a new URP Project.

Either:

• Window > Analysis > Render Graph Viewer.
• Hover over the X axis text labels on the graph viewer to see their tooltips.
• Move through the text labels to change the tooltips. You will have to go through multiple tooltips.

Or:

• Move your mouse across any set of icons that activate tooltips one after the other i.e. Scene Tools, Profiler Controls

Actual results: 
Usually a dark grey box appears, and then the black box. Sometimes the text is cut off by these boxes. These do not disappear if you wait on the affected tooltip.

Expected results: This does not happen.

Reproducible with versions: 6000.0.23f1, 2023.2.0b8

Not reproducible with versions: 2023.2.0b7, 2022.3.49f1, though the way tooltips change is a bit jittery.

Can't test with versions: 

Tested on (OS): Ubuntu 24.04

Notes:

• Easiest to see in Render Graph Viewer. Also seen in the Scene tools so not specific to Render Graph Viewer.
• See attached .mp4 for this happening.