Amazon/streaming rips like:
Helluva Boss (2020) - S01E01 - Murder Family (1080p AMZN WEB-DL x265 Celdra)
tuck the release group in as the last word of the closing metadata
block instead of a "-Group" suffix or its own brackets. That trailing
word is now promoted to a [Group] prefix and stripped from the
parentheses, e.g.:
[Celdra] Helluva Boss (2020) - S01E01 - Murder Family (1080p AMZN WEB-DL x265)
Only fires when the rest of the block already looks like quality
metadata (resolution/source/codec/etc.), so unrelated parentheticals
like "(2020)" or "(Dual Audio)" are left untouched.