Probably not a bug, just more of a quality of life issue.
A number of times I have been given Dupes who have conflicting attributes and traits.
I have attached an example below. She has +7 in digging, but he cannot perform the job 'dig', making her pretty useless.
Especially as she is a Level 7 Miner.....
shuffle the dupes on start of the game. I'm sure you'll find some too.