Tmux detached session - mate-terminal - command not found


I’ve found a very weird problem with tmux in a detached session. I am running Mate desktop 1.22. (My system is also updated)

I create a session called MAIL with a windows on it called win1 and detached:
johndoe@calculate ~ $ tmux new-session -s MAIL -n win1 -d

While outside tmux session I send a “ls” command:
johndoe@calculate ~ $ tmux send-keys -t MAIL ​'ls'​ C-m

I attach to the session and I get the following:
johndoe@calculate ~ $ tmux a
johndoe@calculate ~ $ ​ls​
-bash: ​ls: command not found

If I execute “ls” while inside the session it works perfectly fine.

Other tests I’ve done consist of running the same sequence in Xterm emulator and it works fine. It also runs as expected from out of graphical environment (Ctrl-alt-F1).
I’ve also installed mate-terminal in other computer with Funtoo linux (i3 windows manager). It works as expected.
I’ve been digging around this a lot and I can’t find the problem. Hope somebody has a clue…

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