You can dupe bundles and its contents by first holding an item then spamming; left - right - left..
The items are not ghost items and can be crafted with, check video for more information 🙂
Linked issues
is duplicated by 3
MC-275231
Putting items in a bundle in creative can cause a desync
Resolved
MC-275359
Putting items in a bundle in creative can cause a desync making the bundle item flash
Resolved
MC-275441
The bundle and its content glitch or disappear when pressing quickly the right and left clicks on it
Resolved
Attachments
Comments 2
Duplicate of MC-275231
I've tried this, and I can do this indeed in creative mode. I could however not reproduce it in survival mode.