Description:
When I install an extension, the window does not allow to click on any button like "close" or "remove". The extension is however installed correctly and can be used after killing the extension window or restarting Libreoffice.

For e.g. try to install an extension like Greek speller and check if you can close the extension windows after install.

https://extensions.libreoffice.org/extensions/orthos-greek-speller-dictionary-and-thesaurus

The earlier versions of Libre office worked correctly. I have noticed this in the recent version 6.1.4

Steps to Reproduce:
1. Install any extension
2. Try to close the extension Manager window


Actual Results:
Extension manager window freezes. Needs to be killed using ctl + Alt + Del or close main window.

Expected Results:
Click on "close" button to close extension window.


Reproducible: Always


User Profile Reset: No


OpenGL enabled: Yes

Additional Info:
Similar to but not exactly same as bug 122269
CRASH: Closing LibreOffice after installing an extension with the extension manager open