CustomVariables disabled during Matomo 4 update #16430

see https://builds-artifacts.matomo.org/matomo-org/matomo/4.x-dev/42398/OneClickUpdate_update_success.png

I noticed this when updating the demo to Matomo 4 and was hoping I had this maybe fixed but doesn't seem to be the case. Luckily this now seems visible in a test so it should be reproducible. Curious why only CustomVariables is disabled not not Provider plugin.

@diosmosis can you maybe have a look at this one?

seems this is now fixed.