This is a weird one...
To reproduce, spawn a shulker and also place a shulker box. Wait for the shulker to peek out, and notice that the box magically does as well, even the item in your hand!
Video:
[media][media]Linked issues
is duplicated by 55
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it also happens with all colours and in the creative inventory they are stuck between open and closed
also when the shucker box is placed next to the shucker they will open and close in unison and the shucker box cannot be opened
And when the shulker dies while fully open, all the models stay fully open.
Also, they always follow the most recent spawned shulker or in case of natually spawned ones the nearest (or possibly first rendered if multiple)