Your post would have fit better in the Krita 5.2 Release Candidate topic, then you would have seen immediately where your problem is, and also that it is known as well as not being fixed for now, and also why it is not being fixed for now.
And if you think now, I don’t use Pigment.O, but Imagine Board, both plugins are from @EyeOdin, ergo…
If you install the current stable version, then the plugin will work as expected.
Michelist
@AhabGreybeard, @sooz, @raghukamath, I guess it could be good to move this topic to the Krita 5.2 Release Candidate topic, please decide.