TT insists on listing my 20s part-time student son as a dependent. IRS seems very clear that he's not because he's not full-time. Do I seriously have to delete my son?

(My daughter is correctly listed as a non-dependent, but she has a job).  This caused my federal to get rejected because my son filed as a non-dependent for his stimulus check.  So is this a bug in TurboTax?  I really don't want to delete my son in case he becomes full time again for next year.