You are, sadly, incorrect. PWA §23.N.9 - 12 & §23.O.8 - 9 (trip coverage >12 & <12 hours out, respectively). Bottom line, days off at the front of a REG month are *not* X days a la in a RES month (thus cannot be designated as Golden). One RES day at the end of the month means you're legal to be assigned into the next month, regardless of your REG schedule.

Just next down the ladder (steps 13 - 16 & 10 - 11) covers such assignments with conflict on the REG schedule. Those are a bit less of a bitter pill, since they come with pay protection....

Best defense against this, IMO, is to bid for at least one X day at the end of the RES month.

If that doesn't work (for whatever reason), bid for a trip right at the start of your REG month during such transitions from RES to REG. That way, the single-day of RES is less likely to be used (between only being one day of availability, plus potential rest conflicts with the REG trip); and, if you do get used into your REG month, you'll be pay protected for the dropped trip. Of course, if you really need the first day(s) of the month off, that may not help....