When logging in near or standing on top of shulker boxes, I lose the contents of them, as well as names for them (not coloring, though). It happens in creative and survival, on old worlds and new.
Only tested in single-player
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I've edited it to say "only tested in single-player"
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I have been having the same problem. As of today November 26, 2018; my shulker boxes still delete everything if left placed and i log out and log back in.
can you say if it happens on a server or a single player world?