My other friends who wanted to create a BDS server were frustrated when trying to connect to the local network. When they tried to connect to the server, the message "Your version is not compatible" appeared.
I tried to fix it.
I tested if they could join my server. The first friend managed to join the world using the PC version. I was able to join normally on my mobile, as I was sure it wasn't my server that was having problems.
Next, I tried joining his world and managed to do so via the mobile version.
The second friend faced the same problem.
However, I did it differently: "So I'm going to force this incompatible version error."
The mobile version was working correctly before I started testing.
I went to the Play Store to check for an update; the version was the same, 1.21.100. I uninstalled Minecraft and installed it again. That's it.
The incompatible version error appeared. I was no longer able to join my own server after reinstalling the game. And just to make sure it was the Minecraft bug, I turned off my server and tried to connect, and instead of just the message "Server not found" appearing, it said "Your version is not compatible"
Environment
BSD, Mobile, PC
The error also persists with the local network method