So I've learned If you have the revive heart and die by getting items that reduce HP, you will be revived and put back to your default HP when you move to the next stage. I am wondering if this should be allowed in Any% runs. I personally think it should be allowed, and wanted to know what ya'll think.

I think it should be allowed. It is not a game breaking thing and will not happen often enough to plan around it. I see no issues with this personally.