@DS-Minetest you probably meant to post here, not on #1515, you said:
"I changed the execute command in the settings from "./%e" to ./%e but somehow it doesn't fix the problem, do I have to remove the quotes somewhere else?"
Not sure what else to suggest, except that it may be something specific to lxterminal, but I don't know of any regular contributors who use it to be able to test.
Which directory did yo save the test file in?