The only period where it may look like beta testing is after a new upstream release and it takes some time to make everything work again. Because of upstream release issues last time, there’s a warning now, so you can wait until everything is fine again: (Scroll down to Upstream updates awareness)
To keep the version until everything is working:
So you are not a beta tester, if you don’t want it. The subscription gives you the possibility to autoupdate and don’t care about it anymore. To be a beta tester, you have to enable a separate testing repo.