Url normalization for Patreon is broken. When trying to add https://www.patreon.com/cw/BereniceElenion to Elenion - MusicBrainz , it tries to normalize to https://www.patreon.com/cw, which is a broken link.
Manually changing the url to https://www.patreon.com/BereniceElenion, and then adding it does resolve this, but imo this should be fixed in toe normalization routine.
Hmm. I think these /cw links are new, we hadn’t seen them before. Any idea what they are and how they differ from normal Patreon links? It seems following some links from the Patreon search takes me to a /cw link, while others do not. We should in any case support it, yes - probably just drop it and use the link without it since it will redirect as needed, but it would still be good to know what they mean 
I added an issue to our ticket tracker.