Some snaps app have weird looking window control and fonts

Sorry that I didn’t submit a bug report, but I don’t know against which package should I submit it.
In some snap apps, noticeably snap-store, the window controls are kinda smaller and thinner. Also, fonts look weird, maybe it is using some different hinting.
I attach an screenshot showing this issue.

Is this a known bug? If not, where should I report it? Captura%20de%20pantalla%20de%202020-05-30%2010-23-38

Looking more into this issue, it seems to be limited to the wayland session. And what seems to happen is that snap apps use the wrong interface font under wayland (seems to use the default gnome font instead of ubuntu).

Is this a known issue?