The polymorph self spell and its friends were an ever-changing pile of errata. What was the final word on how polymorph effects work in Dungeons and Dragons, Third Edition? I am uninterested in the Dungeons and Dragons 3.5 rules for polymorph effects.
Tome and Blood is the final word on those spells… probably
Andy Collins, he of the Dungeons and Dragons 3.5 revision, says in the Wizards of the Coast Design and Development Web column "The Polymorph Problem" that Tome and Blood is the most recent source for the spells. I flipped through some Third Edition books post-Tome and Blood to confirm this and didn't find any later reprints of the polymorph spells. So, while it's possible errata later than Tome and Blood (July 2001) appeared on the Wizards of the Coast Web site or in Dungeon or Dragon, I've not been able to locate any.
A few months prior to Tome and Blood, the spell polymorph other did appear as Official Errata from the Sage on page 45 of Dragon #280 (Feb. 2001). Also, I've Psionics Handbook errata from May 2002 that includes the text of the 4th-level psion/psychic warrior power polymorph self [psychometabolism] (Psionics Handbook 92) that's different from the Tome and Blood spell polymorph other and self, even after accounting for a necessary switch in pronouns and targets, but this undated PDF claiming to be Psionics Handbook errata includes the Tome and Blood version of polymorph self (altered appropriately from other and to a psionic power), so I don't know what's up with those.
By the way, this is pretty handy collection of errata for Third Edition through Magic of Faerûn (Aug. 2001), and if you're sifting through Third Edition books anyway, you can go in order using this list.
Use Polymorph (et al.) from the 3e PHB, noting there are clarifications, but not errata, to it. The reprints in the 3.5e PHB may be superfically different, but are fundamentally the same "become a monster manual entry" that later 3.5e era errata changed