Dopus 12: sudden refresh/browsing file pane SHRINK issue

For some reason when refreshing window or browsing to another folder, the window file pane briefly shrinks (if the pane is wide enough, not when the window is smaller and other panes are open). The fonts are deformed, and to the right briefly appears an extra gray pane (or perhaps it is an effect of the window itself being shrunk).

Not sure what triggered this. No other settings in Windows have been changed, such as DPI etc. It seems to be a Dopus issue. Windows Explorer doesn't do it.

Here's a quick gif illustrating the issue:

Animation

This happens in any viewing mode, and even when switching mode.

Restarting Dopus of even the PC has no effect.

I uninstalled scrubbed and reinstalled Dopus and it still does the same thing, even on a brand new clean configuration.

Turning off transition animations in Preferences may help with the scrollbar appearing for a moment.

Most of what you’re seeing looks like normal column auto-sizing behavior.

Okay, that got rid of that shrinking effect.
However, now no animations...
If you look at the gif carefully, it's not the sidebar appearing, but the whole window pane being deformed in width.
I guess the question is, what got the animation to seemingly slow down or become jerky to the point of being noticeably unpleasant?

If the system is in a mixed-DPI mode (different DPis on different monitors, or DPI changed since boot) but wasn’t before, that could explain the change.

Other than that, I am not sure what would change things, since Opus 12 itself hasn’t changed in over a year now.