Do you already have some of the episodes in the batch?
I don’t the batch release being processed in those results though, if it’s’t not there or in another file Sonarr couldn’t grab it.
Anime season searches rely on individual searches since there isn’t a season number to search for so each episode is processed individually and with non-season packs (batch releases aren’t classified as season packs) Sonarr prefers less episodes in the release. I’ve made a change that’ll be in a future release that will prefer batch releases for anime over single episode releases.
They need an absolute episode number or searching will be rejected fuzzy searching based on the title is not supported (an unreliable in most cases).