I wouldn't expect everyone to know how to pronounce the word.
I wouldn't expect every English grad to know how to pronounce the word because they might not have studied that particular play.
I would expect every teacher, English grad or not, who knows they're going to be teaching Macbeth, to have watched the play in at least two versions, read around it and studied it a bit, before teaching it, even if it never came up on their undergraduate degree. You do get advance warning of which texts you're going to be teaching. The pronunciation will be clear from watching any performances of the play. It is not a minor word in that play, either.
Same with teaching As You Like It and knowing that Jacques is pronounced Jay-kwees in that play. Not something everyone would know, but the teacher should.
For me it would be a flag that would make me wonder how much the teacher had studied the text they are now teaching. Learning about a text alongside your pupils can be OK sometimes if you have other teaching skills, but for really able students it is necessary for the teacher to genuinely know more about the subject than their class does, and really able students need teaching too.