I don’t know if it’s any kind of connection, but I noticed the issue just after cross-faction/cross-realm guilds were enabled, and I had just merged my alliance and horde characters
on MG and WrA into my main guild on MG. That is the guild bank that was stripped.
I have another bank alt in a guild by themselves only, no other characters, which was unaffected.
Was it only cross-faction or cross-realm guilds that were stripped?
(I am totally speculating here, feel free to prove me wrong if I am)