I don’t know if I’d consider this a issue with Whisparr or with the tracker.
Maybe a bit of both, you could reach out to both of them I guess. But overall I’d think the onus is on Whisparr devs to work towards being compatible with any indexer thrown their way. It is unlikely that any tracker admins will prioritize being compatible with Whisparr so tracker admins may not see it as an issue worth fixing on there end.
EDIT: Not sure if you can see this reply since Lemmy.world just started blocking piracy related communities (see lemmy.world/post/3175920), may be worth creating an account here or another Lemmy instance that isn’t blocking !piracy