[Container] Shulker Boxes Disappearing when Broken

[Dracorexion]

Describe the bug
This has occurred on at least 3 separate occasions that I know of, twice to myself and once to another player. We both have shulker boxes that we hold our Pokeballs in and carry around with us. At some point we placed the box on the ground, interacted with it in some way, and broke it. We each later noticed that the shulker box was not in our inventory, despite having room at the time we broke it. Using /co lookup, the last action performed on the shulker box was them being broken, with no sign of them being added to our respective inventories when the bug occurred.

To Reproduce
Steps to reproduce the behavior:

1. Have a named/colored shulker box
2. Place on the ground
3. Interact with the box (possibly adding/removing something from its inventory)
4. Break the shulker box (less than 20 seconds after placing)
5. Check to see if shulker box actually entered inventory or not

Expected behavior
After breaking the shulker box, I expect it to drop and enter my inventory.

Username:
Dracorexion (myself) DrJerolekk (other player affected)

Server name (all applicable):
Orion, though I would assume the others could have the same bug

Additional context
I have noticed a few potential connections that may have something to do with the bug. Firstly, in all instances the shulker box is question is named and colored. Both boxes also only held Pixelmon related items, namely a large amount of various Pokeballs. Both boxes were placed, interacted with, and then broken in quick succession (under 10 seconds). I cannot confirm if DrJero experiences this, but sometimes when my shulker box drops when broken, it does not show up, though will pop into my inventory if I walk over the spot where I broke it. Again I'm unsure on if any of these conditions have any actual link to the bug itself. When staff were able to get the shulker boxes back through rollback, the boxes did lose their names.

I've been running around my claimed area with a large number of shulker boxes to easily keep materials near me, and none of them have disappeared as of yet. 9 are named "Podzol" "Gravel" and "Coarse Dirt" to keep them organized, but none of them are dyed.