linux - Why is a new group not active after SSH login via tmux?

This is my situation:

I have added a new group to my user.

I have verified /etc/group is properly set up.

If I do su - myuser the group is shown with id -a

But login-out and login-in again (via ssh) does not reload the group: id -a does not show the new group

It is as the SSH connection was reusing some process with the old group settings.

What could this be?

Additional info:

I am using tmux, but on the client. The server where I am sshing to (and where I am changing the groups), has no tmux running.

It could be that this is related to ssh connection sharing.

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