NOTE: Editor appears to freeze but it's not really frozen but instead stops responding to mouse input.

Steps to reproduce:

Create a new URP Project
Navigate to Edit > Preferences > Search and switch "Object Selector" to "Advanced"
Navigate to Edit > Project Settings > Graphics
Switch the Asset for "Default Render Pipeline" to any
Once the native DialogBox opens, switch to another app and then back to Unity

Actual results: The Editor stops responding to mouse input but keyboard can be used to dismiss the dialog.

Expected results: DialogBox can be dismissed with mouse click

Reproducible with versions: 6000.3.0a1, 6000.3.5f1, 6000.4.0b5, 6000.5.0a4

Not reproducible with versions: 6000.0.66f1, 6000.1.16f1, 6000.2.0b2, 6000.2.15f1

Tested on (OS): Windows 11

Notes:

Only seems to be an issue with this specific scenario, i.e. native DialogBox opened by Advanced Search window (doesn't occur with other dialogs)
Dismissing the dialog without switching apps can still sometimes hit this issue but it appears infrequent

Workaround:

Click the MainWindow's title bar to focus the dialog box, and then use the keyboard to dismiss it. That is, select a button with the arrow keys and press Enter.

Update:{}

The original fix didn't completely solve the issue, and the bug still repros, though it's now less frequent. A "complete" fix is in progress.