I was wondering if vanish could handle shulker boxes like normal chests, so that you can open them silently without the need of toggle nointeract. Right now its not possible to look into them silently.

Running VanishNoPacket version 3.20 on spigot 1.11.2

(what @TheMolkaPL said)

We can't block shulker boxes because Bukkit doesn't support them (and I'm not talking about its forks like Spigot).