When I'm running in a serial terminal (screen, tio, etc.) yakuake is not giving the serial terminal its entire space, so I end up with a terminal showing only a few lines.

The content is all there, but you have to scroll back the entire time. Any new line input or output will jump back and only display the limited output. It looks as though the line offset is miscalculated.

Using konsole standalone or any other terminal emulator does not show this behaviour.