Gnome session/apps using KDE lib

This hasn’t happened before the 12.3 update (was working great on 12.2) and it’s nothing urgent like other stuff being posted here but here it is.

After the upgrade I logged to GNOME session, logged out, then logged to KDE to check something, logged out and when I got back to GNOME, Firefox (and other programs, such as Banshee) are using KDE libs. Again, it’s not too bad but it can get annoying.
I installed KDE pattern while I was on 12.2 with GNOME base system (now I added E17 but that’s another story)

example

How do I get it back to normal or will it be fixed via future update?

Thanks.