Mace Windu died in Episode III. If canon, it would have to be between Episode II and III, of course, not years later post Episode VI. But let's say he survived and "Book of Boba" tracked him down, right? Two approaches: the old school Fett fan opinion is he'd slaughter the Jedi who killed his father, and new school Fett fans might say he's not even a real crime boss but this totally new character post-Sarlacc so they'd have a chat and surely get out of each others way. :-P Personally, an old school Fett fan here.