Looks like everyone enjoys guessing things in non-retail releases, so I'll join in on the fun: my guess it's the same type of deprecation warning you'd normally

Looks like everyone enjoys guessing things in non-retail releases, so I'll join in on the fun: my guess it's the same type of deprecation warning you'd normally only get in the system log, but now you get a popup as well. Maybe to nudge developers to not lean on deprecated APIs, maybe for something else we don't know about yet.