switching images with ctrl tab

I cannot switch between opened images with ctrl+tab. it shows the next one in line, but always turns back to the active one when I release keys. ctrl+shift+tab works as expected.
Anyone else having this problem? I’d report a bug then.
(I am using the prealpha krita-next build, but I think it was like this in 4.x as well. maybe I fumbled my preferences or something)