org-priority face has additional space starting from org-mode 9.4

Hello Protesilaos.

This is not a real bug, but looks like some incompatible changes in org-mode starting from version 9.4.

Before the box around org-priority item wasn't extended with one additional space:

And after updating to version 9.4 this box doesn't look as good as it was before:

I'm not sure what should be the solution, maybe to report bug to org-mode or disable this box on theme level.