How to reproduce:
1. Open the “CrashRepro“ project
2. Open “Assets/UI/NPCUI.uxml“ by Right-clicking and selecting “Open“
3. Select “#Background“ in the UI Builder Hierarchy
4. Expand the “Size“ tab in the UI Toolkit Inspector and change the Width and Height from % to px

Reproducible with: 2022.3.53f1
Not reproducible with: 2021.3.46f1, 6000.0.29f1, 6000.1.0a6

Reproducible on: macOS 14.6.1 Sonoma (Intel), macOS 14.7 Darwin (M1) (reported by user)
Not reproducible on: No other environment tested

Note: This issue doesn’t consistently reproduce

First few lines of stack trace:
#0 0x00000105848730 in ShowDelayedContextMenu(bool)
#1 0x000001058652b8 in GUIView::OnInputEvent(InputEvent&)
#2 0x0000010445a1b8 in GUIView::ProcessInputEvent(InputEvent&)
#3 0x00000105872e18 in -[GUIRenderView handleEvent:]
#4 0x00000105873750 in -[GUIRenderView mouseUp:]
#5 0x0000018bea3a64 in _routeMouseUpEvent