The Bug:

A bundle in a bundle occupies 4 slots at once, a bucket of salmon, or saddle occupies all 64 free slots.

P.S. These items are just examples of the bug.

How to reproduce:

1. Press "Create New World" on version 1.19.3, select Creative mode, press "Datapacks" and select "bundle".
2. Once you are in the world, search for 2 bundles, one bucket of salmon and one saddle.
3. First, try to put one bundle into another. Then take the bundle out. And then do these actions again with the bucket of salmon and saddle.