Obviously encountered with N altars most easily. When livesaccing, if you attempt to sacrifice a creature of the same alignment as the altar, you get told that the deity does not welcome sacrificing her own creatures or some such, and you get a second chance w/ no[?] harm to piety / no conversion of altar / etc.

When offering corpses of same alignment, there is no second chance and altar is converted to C immediately, etc. There should either be a second chance when offering corpses of same alignment (preferred) or no second chance ever (would be p. bad solution) to be consistent.

Obviously, if you use second chance livesaccing, you do not get second chance offering corpse or vice versa - only one second chance.