The Bug:

Open bundles can be held by the mouse cursor when swapping items.

If you were to try and hold an open bundle normally with the mouse cursor, you will notice that the bundle instantly changes back to its original texture instead of its open state. However, when you pick up the bundle by swapping items, you can hold an open bundle with your mouse cursor.

Steps to Reproduce:

1. Obtain a bundle and place one stone block in it.
2. Get some dirt and hold it over the bundle.
3. Scroll using the mouse wheel and then right-click and observe how you're holding an open bundle with your mouse cursor.

Observed Behavior:

Open bundles can be held by the mouse cursor when swapping items.

Expected Behavior:

Open bundles would instantly change to their original texture when held by the mouse cursor when swapping items.