When is server behind BungeeCord proxy (Waterfall fork) player cannot self attune in in attunement altar.

It looks like some kind of nonstandard network packet cannot go through client<->server.

1.11.2 - astral sorcery 1.4.3

proxy: https://github.com/WaterfallMC/Waterfall

Using forge's standard network wrapper. If it doesn't support even that, i won't bother dealing with it anyway as it would require a massive rewrite.