I found 2 annoying things about water and lava sigils and Im suprised that i couldnt find any issues about that.
-When you try to use lava sigil in sigil of holding it doesnt works(didnt try water sigil yet)
-When you try to put them in filled sockets , it doesnt put them in , it uses it.You need to make some tricks like use fences to prevent them from putting liquids, but you know, a little annoying.

Second issue already fixed, I'll take a look at the first one

EDIT: 1st issue confirm, will look for a fix

Thanks

Fixed