They can still make multipule finds(atleast I assume their seemingly random skill-ups in the middle of a job are related to rolls to find stuff), it's just that now they'll only present their findings when they finish.
I had a group in my current non-Sol game get a few skill-ups while working, then announce they were done and had found expanded deposits of two minerals, and increased accessability of one of those and a third one, then colony into tab said completed and the 'we're done here' notifications started. The few other positive results were similar, if more limited.