Hello!
I found this bag 1 year ago. I was thinking that it is because Minecraft Earth Skin.
When I'm trying to play with friends in my world using cellular data, multiplayer automatically disabling (using cellular data: on.). While I am using WI-FI everything is ok. Using cellular data i can join to my friends and servers, but i can't turn on multiplayer game
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Thank you for your report!
We're actually already tracking this issue at MCPE-44422, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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