That’s a change that was neither documented nor announced. There is another breaking change in listing organization users - it has entirely new structure, that is not yet documented and is not explained in changelog. This actually broken terraform provider for all existing users of this resources and we had to roll out a hot fix.
The structure for organization users have not been rolled back on my end. I’ve also noticed that the return code for the create methods for invites/service accounts/project users/projects have changed from 201 to 200