White flash upon saving

I am saving a document in Writer and get a white flash upon saving the document each time.
This doesn’t happen on fresh start but after some time like some hours.
version 6.3.5, happens in 7.4 too.

bug report

User Profile Reset: Yes
Additional Info:
Version: / LibreOffice Community
Build ID: 184fe81b8c8c30d8b5082578aee2fed2ea847c01
CPU threads: 4; OS: Linux 5.4; UI render: default; VCL: gtk3
Locale: en-IN (en_IN); UI: en-US
Calc: threaded

I notice you are under a dark theme. Dark themes exhibit difficult coexistence with LO. Do you see the same sort of flash with a non-dark theme?
What is your Linux distro? (Linux 5.4 seems to me a bit old; my kernel is 5.19.6 and I am not “bleeding edge”)

Actually: what is the question here?
You created a good bug report. I’d suppose that now it should be handled (either you get some questions, or maybe it gets confirmed) … but writing it here, you likely expect some answer to an untold question. Which is that?

I posted here in hope of quicker discussions, but maybe that’s not a good idea. Let’s continue on bug report page only.

distro is Linux Mint 19.3.
happening on non dark theme too.
non dark theme video