Selected categories disappear on switching tabs

oh i havent realized that those empty selected filters with the undefined chips could happen on and off! i always ran right away into it as soon as i've switched to the core modules source type. never tried switching tabs repeatedly, so never fully grasped that the hiding can switch on and off. at first i thought this issue wouldnt be reproducible and about something else than i've raised in the slack on thread. but understood now the steps to reproduce and also am able to confirm that the MR603 fixes the issue. thank you! only tested the MR functionally/manually, leave it at needs review that someone else can also review the code.

I tested the MR and the issue reported here is fixed, also the code changes looks good to me so marking it RTBC.

Woohoo! Testing this caused me to notice separate issues with the Core plugin but they are present on 2.0.x without this MR. And this MR seems to fix the issue the way I caused it. And RTBC with two other manual tests, so here it goes!