Cursor display bugs on ancient Konsole version

[raphCode]

On an 2016 Konsole version, whenever I open zellij, the terminal cursor is prepended by the character q and shifted to the right:
Shell prompt, I just typed echo hello world:

After pressing the left key 5 times:

Also the q remains upon pressing enter in the shell:

The shell still receives the correct text upon enter, this seems solely a display bug. Entering scroll mode shows the correct text in all cases where spurious q's appeared.

This happens also in e.g. vim, here I just entered the command mode without typing anything:

This looks like I am about to quit, but in fact the command is empty.

Also happens through ssh connection and with --simplified-ui true
XTerm on the same machine works properly.

$ konsole --version
Qt: 5.6.1
KDE Frameworks: 5.36.0
Konsole: 16.04.3

[raphCode]

I just found out that using zellij through a mosh session fixes the problem. weird.

[azarmadr]

What is mosh?

[raphCode]

https://mosh.org/