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