I always like simple first.
You have been looking at the fork, did it move the same distance before and after each bleeding? If no then there is a problem with the hydraulics. If yes then a problem with the mechanical part ie. fork bearing or pressure plate.
I have had times when slaves will not expel all the air and had to be filled on the bench. Very unusual for a clutch system to suck air in after bleeding as it is under pressure from the pedal on the return stroke.
Many strange thing have happened to forks, bearings and pressure plates. Turns , shifts, and broken springs among them.
Beyond that you maybe "lucky" enough to have more than one problem at a time.
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