Comment 6 for bug 1813986

I'm running Debian 10 (buster), tmux 2.8-3, byobu 5.112-1.1 and see the same behavior.

It appears to be related to the '-k' option to new-window in byobu's tmux bindings.

The following command creates alternate key bindings without the -k option and stores them in the users' personal tmux keybindings:

grep new-window keybindings/f-keys.tmux \
| grep ' -k' \
| sed -e 's/ -k//' \
>> ~/.byobu/keybindings.tmux

After this, things seem to work as expected