When a shulker box containing stacked unstackable items (such as armor) is broken, the items unstack and overwrite other items, and are partially also put into hidden slots. Once this box is placed another time and then broken again, the hidden slots disappear. A shulker box tooltip mod was used to display the items inside.
If the items are very NBT-rich, the player may permanently be locked out of joining the world/server due to the size being too large for the client ti handle. If it is dropped as an item, everyone within render distance is affected.
Image unknown-4: Shulker box containing various types of stacked unstackables.
Image 2020-12-25_20.56.30: The same shulker box after having been placed and picked up again.
Image 2020-12-25_20.57.46: Yet again the same shulker box, after having been placed and picked another time.
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I cannot do this in an unmodded game, because the vanilla game does not allow me to see the hidden slots of shulker boxes, nor can I (to my knowledge) view NBT data in survival without the use of a modified client. These problems still persist in vanilla, and if I repeat the process with enchanted armor I still get kicked because of too much data.
Thank you for your report!
We're tracking this issue in MC-170536, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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This report is invalid as your game is modified. With the screenshots you've provided, I can see that you are using modifications when this issue occurred and the bug tracker only handles problems relating with Vanilla Minecraft. If you are able to reproduce this issue in a vanilla environment (without the use of mods), feel free to create a new report.