Reproduction steps
1. Open the “UIElementBug” project
2. Press the “test” Button in the “TestWindow” Window

Expected result: Text is displayed in the Window
Actual result: No text is displayed in the Window and two identical errors (NullReferenceException: Object reference not set to an instance of an object) are displayed in the console

Reproducible with: 2022.1.0a11, 2022.1.24f1, 2022.2.8f1, 2023.1.0a21
Not reproducible with: 2020.3.44f1, 2021.3.18f1, 2022.1.0a10, 2023.2.0a2
Fixed in: 2023.1.0a22

Reproducible on: Intel MacOS 13.1

Notes:

• The issue does not occur when resizing the window a little and reopening it
• Pressing the button rapidly makes the issue disappears
• The issue disappears when resizing the window a lot
• Sub-menu items of “Test” all produce different windows with very similar results. The key difference is with the “test” sub-menu item producing the issue