Haven't had time to look into this too deeply but it seems to be an issue in the client (Hazel 5). The problem then is that (a) I would need a patch to an older version of Hazel just for this and (b) you wouldn't be able to update to it unless you do it manually, which is the problem in the first place.
At some point I'll look into some way to workaround it on the server side but for now we have the awkward situation currently.