The Bug:

The "/item" command cannot replace items within jukeboxes.

Steps to Reproduce:

1. Place down a jukebox and stand on top of it.
2. Replace the jukebox's "container.0" slot with stone by using the command provided below.

   /item replace block ~ ~-1 ~ container.0 with minecraft:stone

3. Inspect the jukebox's block data by using the command provided below.

   /data get block ~ ~-1 ~

4. Observe if the jukebox has anything within its "container.0" slot.
5. Take note as to whether or not the "/item" command cannot replace items within jukeboxes.

Observed Behavior:

The "/item" command cannot replace items within jukeboxes.

Expected Behavior:

The "/item" command would be able to replace items within jukeboxes.