Frieren's second ending is filed differently in every database I checked

Small thing I ran into while building the theme-songs section. AniList credits "bliss" as ED2 — its own slot, with milet on vocals and Evan Call arranging. AnimeThemes files the same song as a variant of ED1 instead, tagged to episode 1 rather than a run of episodes. Neither is wrong exactly. The first episode was feature-length, so whether the song that closed it counts as a second ending or a one-off version of the first is genuinely a judgement call. It made me curious how other people think about it: if a show uses a different ending for exactly one episode, is that an ED2 or not?