In the current 2022 VRC beta, the keyboard will unpredictably highlight the entire message as you are typing, causing it to backspace the entire message the next key you press. This makes it incredibly difficult to type out messages, especially longer ones because this will occur completely randomly. Sometimes even multiple times in a row.
As well, there can be issues where elements on the UI cannot be interacted with, making it impossible to close the chatbox window. These issues are hard to capture or reproduce, as they occur completely randomly. Two other people in a session with me (both in the 2022 beta) also observed this happening.
Video of the former issue occurring: