I can't see how this is the plasterers fault, if the plasterer turns up to do a skim finish the he/she will only have finish plaster on board and would of priced accordingly.without seeing it, it’s not possible to know if the door lining is too wide or the lining has been fitted in a twisted wall - ie the door lining was fitted nice and flat so the door when fitted sits flat, but the result is the door lining ends up tapered going from flush to very proud over the length - this is a problem that should’ve been overcome by plastering
The walls would have to be bonded first then skim finished to overcome the inaccuracies caused by the proud lining, double the materials double the labour.
The plasterer could of communicated this to the customer or whoever he was subbing to.
But we do now live in a "It's not my problem culture". "Rather than "What can I do to make the next trades job easier".