: Menu items are displayed in different background colours when they are selected multiple times

Steps to reproduce:

1. Create a 3D project
2. Add 3D Object -> Cube
3. Window -> Search -> New Window
4. Enter the search string "Cube"
5. Save search results to the "Project" list (diskette -> Save project)
6. Observe the background of the "Save project" menu item
7. Repeat the same workflow several times and observe the background changes

Expected result: Background always should be the same.

Actual result: Background changes. Added video in the "Attachments" section.

Reproducible with: 2023.2.0a21

Not Reproducible with: 2023.2.0a20, 2023.1.2f1, 2022.3.4f1, 2021.3.27f1

Confirmed OS: MacOS Monterey, Version 12.6.5