Font randomly switches back to Sans in editor

Hello,
since Qt Creator 5 I have this weird bug where sometimes editors will use some default system font instead of the font I chose in the preferences when switching to a file. Zooming in or out reverts back to the correct font.

I cannot find a consistently reproducible way to reproduce it but it seems to happen more often when the zoom level is > 100% and when I choose a file from an editor's file chooser.

Here's a video example of what I'm seeing: https://streamable.com/dwwff2