When right-clicking on a full bundle in the inventory screen while the inventory is full, the items from the bundle will disappear if the player is in Creative mode.
Linked issues
is duplicated by
Comments

When right-clicking on a full bundle in the inventory screen while the inventory is full, the items from the bundle will disappear if the player is in Creative mode.
migrated
(Unassigned)
Confirmed
Inventory
20w45a, 20w46a
20w48a
Retrieved
I tested this (in 20w45a).
The items only disappear if you are in creative mode and you open the bundle by right-clicking it while the inventory is open. If you're in creative mode, and you open it while the inventory is closed by having it selected on your hotbar and right-clicking, the items are dropped on the ground. If you're in survival mode, the items are always dropped on the ground, no matter how you opened the bundle.
This is likely related to MC-204170 (A.K.A. MC-87935).