Issue:
avatars with massively oversized bounds will "lock out" the menu for quest (and pc) users and prevent them from switching with motion controllers, but, quest does not have the fallback ctrl+\ shortcut to "break out".
Replication:
enter into an avatar with massive bounds and attempt to switch out.
Possible quick resolution:
Making the safe mode shortcut (Both Triggers + Both Menu Buttons) change the user's local avatar to the robot as well as everyone else's would be a great workaround for these kinds of issues before the menu's selection issue can be corrected.

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