This is on Sonarr 2.0.0.5228 on Mono 5.12.0.226 on Ubuntu 18.04.
I’ve added the show Mobile Suit Gundam 00 (https://www.thetvdb.com/series/mobile-suit-gundam-00). Its doing a series search but not able to find a lot of episodes. I did a manual search, and found this release, which is exactly what I’m looking for -
[AnimeRG] Mobile Suit Gundam 00 (Complete Seasons 01 & 02) [1080p] [DUAL-AUDIO] [BD] [Batch] [x265] [pseudo]
(see here
Unfortunately, sonarr doesn’t seem to be able to parse the series name from this title. Maybe it’s because of the “(Complete Seasons 01 & 02)”? I know anime releases often have “non-standard” titles.
Easiest repro is to add the show, and this indexer: https://feed.animetosho.org/nabapi, and do the manual search. I can also provide the debug logs if necessary, though I suspect its an obvious problem.