Simply put, Prism hasn't since the introduction of Shulkers to Minecraft been able to support rolling back shulker boxes with their respective inventories.

It tracks inventory events on placed shulkers, but you cannot rollback a shulkerbox break, for example and also get its inventory back.

I only noticed that The container-access action is not logged for shulker. Fixed in #274 . Prism will rollback the items in shulker with param item-remove, just like what we do with chests.
Do you mean Prism should log the data in shulker when breaking / placing it? But that may cause a mess if we don't add other judgments.

Correct, it should. You should be able to rollback, for example, an item-drop that is a Shulker and it should return the shulker AND its inventory.

This repository is no longer active. You can try to resubmit this at the current Prism repo here https://github.com/prism/PrismRefracted