Clear Terminal is buggy
Clearing the terminal either by Ctrl+L or the "clear" command is buggy. It doesn't clear the arrows on the left and so it hides the result of the command following the clear command.
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I am aware of this bug, but there appears to be no straightforward solution. The obvious approach would be to clear the markers if a line is cleared, but unfortunately that breaks arrows altogether, as bash by default (for whatever reason) first draws the command prompt (with the injected marker sequence), then erases it and draws it again (don't ask my why, it's abysmally stupid IMO).
Thanks for the quick answer. I hope you will find a solution. I think your terminal emulator could become my favorite one. Great job, really =)
This problem has much improved but since https://github.com/p-e-w/finalterm/commit/0624dc9580fa87854fb0ef9567d31a5fe5dcf6ea there appears to be a different bug when using Ctrl+L (does not occur when typing clear) that causes invalid command detection (spanning two lines). As command history is now pulled directly from bash this might be a bug in bash though.