The stock creality extruders are pretty trash. They have a tendency to not grip the filament well enough, or alternatively, grind the shit out of it leading to slippage.

My first upgrade on those machines is always a dual gear extruder. There should be a drop-in replacement for <$20 on Amazon. They’re almost always coated in red paint, should make it easy to find :p

Also, make sure [include mainsail.cfg] is present in your printer.cfg file. Apparently this is important when changing frontends (octoprint -> mainsail).