If "Automatically enable all new beta features" is checked in [[Special:Preferences#mw-prefsection-betafeatures]] and you de-enable one or more beta features and save, the features stay enabled.
They do de-enable if you uncheck "Automatically enable all new beta features" but then you miss this feature. I am sure it wasn't working like that.
At this moment it is not enabling all new beta features but all of them.
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Sounds like something that could have a browser test within the BetaFeatures extension.
@zeljkofilipin is there a method for tracking all of the tasks that could have browser tests?
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I've merged this into the older duplicate (and used the clearer description from here, thanks Geraki!), but I wasn't sure whether to copy across Addshore's question, given the addition context already in the comments there. I'll leave that to you.