Online play

What happens exactly when you try to join your friend's world?

When I try to enter the world, it gives an error. I found a way to fix it just turn off the Internet, but because I turn off the Internet my friends can't see me but I don't see them

What exact error message do you get?

This error pops up though, the Internet is connected to me.

Since new versions also have problems, I stopped at 1.16.40. And on a newer version, this error just flies. On versions 1.16.210 and higher, this problem is not present, but there is even worse.

Sorry, I don't understand what you mean by "On versions 1.16.210 and higher, this problem is not present, but there is even worse". So is this still a problem on the newer version or not?
What about the newest version?

The problem is solved with new versions. But on new versions my worlds freeze. So we can say this problem is solved on new versions.

Duplicate of MCPE-101291.