If you lose all Temporary HP from the Tenser's Transformation spell, does the spell end?
I played a game where I used an item that has the effects of the Tenser's Transformation spell. I know the spell lasts for 10 minutes. Since the effect came from an item, I didn't need to worry about making Con saves to maintain concentration on the effect when taking damage.
During the course of the combat, but before the spell's duration was over, all my Temporary HP from the spell's effect were used up. The GM said that the spell also stops when that happens. I could not find any mention of this in Xanathar's Guide to Everything. Is there any errata for this or an official ruling in the Sage Advice Compendium that proves or disproves this?
Any mention dealing with Temporary HP only states that if there are any remaining Temp HP left over after the spell expires, those remaining THP go away. I don't see anything as of yet saying that the spell/effect ends when THP runs out.