VS freezing after modification of the Qt Modules list

1) Project under local and remote git repository. Commited and pushed. Marked by "Lock" icon sign.

2) Modify Qt Modules list. Add "XML" module for example. Sign "lock" is not changed by "red check" as expected.

3) Rebuild project

4) VS is not responding (freezed) forever. Can be killed with Task Manager only.

As I understand the problem is that - after adding new Qt Module (xml) the project was modified but not saved. So workout is - "Save All" after modification (p.2). After that rebuild is starting and VS is stable. By the way, after saving the project marked with "red check" icon sign as expected.