Custom Assistant model does not update after availability change of the model used

EEtw

The model of the custom Assistant does not get updated should the model that was used change availability (in my case: Gemini Pro got put into the Ultimate tier, while I am only in the basic one).
Instead, the previous model stays selected and can still be used, even though it should not be available to the user anymore.
I suspect that similar behaviour can be observed when the user downgrades from Ultimate to basic, but I cannot test that.
See the following images:

I expected the model to be changed to another option that is available to the user.

z64

Thanks! This is expected for now as you were one of the super early access users. It will take full effect with our subsequent major rollouts to Assistant.