Mtg invite are being sent for Monday morning, pre lunch. Ideally around 9 or 10, 15 mins, 30 if the boss is more empathetic to talk or help more.
Invite header will have a formal tone and not be a 'sync-up'. Straight giveaway is "1:1" "name1:name2" or just a vague "meeting" headline.
Mgr has to click on a link to indicate conversation happened. Be calm, its not easy for anyone, most difficult if you are at the receiving end.
You can ask for feedback, but trying to reason will be fruitless as the person is already talking through a script. Thats not the person you know them to be in that mtg.
Negative scenario: ive known some a--hat mgrs clone the same invite with entire team so the person doesnt leak it.
You should leave such leaders anyway like avoiding the plague.