[MC-262779] Using the /data command doesn't change the suspicious sand data.

When I use the command "/data merge block ~ ~-1 ~ {item:{id:diamond}}" on suspicious sand, it doesn't change the block data.

Steps to Reproduce:

Create a new world on 1.20 pre4.
Place down suspicious sand.
Stand on top of the suspicious sand.
Use the command mentioned above.
While still on the suspicious sand, type in "/data get block ~ ~-1 ~" to get the block data.
You will notice that the block data didn't change if this affects all computers.

Notes: I remember this command working before.

Comments 3

An item with only an id is not valid, it needs a Count as well.
Works correctly if you provide a Count value.

Invalid.

Thanks for the comment. I didn't know that was required, so it must've appeared in a snapshot without my knowledge.

Count has been required on item stack to be a positive value since 1.8/1.9, way before this block was added.