QDS hangs when trying to add signal handler

When trying to add signal handler, the whole QDS hangs with 100% cpu consumption. Only way out of it is to kill QDS.

Steps to reproduce the issue:
1. Add some quick control to the application e.g. a button
2. Right click on the button in Form Editor
3. From the context menu select "Add new signal handler" or from under the Event List menu "Connect signal to event"

Actual outcome:
Entire QDS hangs with 100% cpu consumption.

Environment: macOS 12.2.1, Intel cpu