Players Able to Change Mode on Clients

Not necessarily limited to this version or a bug on the server.

Are players supposed to be able to change the game mode (Survival to Creative) from the client when connected to Bedrock Server? Bedrock Server mode is Survival. I think in the past, players could not change mode in settings, but one of my kids playing on the server showed me and was able to fly around like as expected (Creative). Client settings were changed back to Survival after a few seconds. Luckily, it didn’t appear to break achievements.