Reducing raft thickness in 3.3.0 to less than default 2mm (i commonly use 1.25) makes the raft label protrude through the raft edge and face downwards as well as upwards. This, in turn, causes the minima detection to go crazy, because each of those letters is - well - a minima.
I guess no one at Formlabs changes the raft thickness, so this flew under the QA radar.