I remapped the pedals behavior as follows:

Controller 66, v=0(left pedal) = "load last record sequence"
And
Controller 67, v=0(middle pedal) = "play(standalone)":

It’s very convenient to play, and then listen to what you’ve played, analyze it, change it and play again. This is very useful for practice.

I press the left pedal and the last thing played is loaded:

But if you press the left pedal again, then emptiness will be loaded (unnamed) into the midi player:

Previously, when I used a MacBook, I don't remember encountering loading an empty midi sequence when I pressed the pedal again. But now this happens on Fedora 39.
Maybe this is a small mistake?

Or is there a way to not erase the last loaded entry in the midi player by using an empty value?