Drawn masks does not show up in yellow

Is it just me and a user problem? When I create a mask no matter what module the yellow preview of the created masks does not show up when I click on the button “display mask”. Instead of the yellow mask the whole image turns b/w. Changing the mask opacity does not fix it.
I know it did work last week but at some point it has stopped working, can’t remember when. So I presume it just broken at the moment.
Using git version and Fedora.

Assuming for the moment that you are using darktable 3.7 and not 3.6 then you are probably running into this issue: