I'm on 3.2 and I'm seeing this bug prior to researching driods.
Starting with mechanist and all jobs filled, when a new biological pop is born it displaces a worker robot.
That means biological migration will not occur until all robots have been displaced, which is insane.
Think this through... your homeworld reaches capacity and you want to use transit hubs. Transit hubs require unemployed pops. Unemployed biologicals will displace any robot worker...
Obviously this is an issue with job weights so things like strat resource jobs might stick as the bug report said, but for the base case of farmers, miners and technicians this would seem to be.. broken af, worse than 3.1.