Adding a clarification to PDC on copying data.

[NinjaMandalorian]

A quality of life improvement for developers, adding a note that specifies data is not automatically copied over for you would help with confusion.

Following the components update, the source ItemStack components (including PublicBukkitValues) are copied to the "components" section of a placed block entity, but the PDC is not copied to the block entity itself.

This can be deceiving, as with commands such as /data it appears the data is carried across to a TileState, when it is not.

This particular instance caused myself and others significant confusion, leading to the suggestion of creating a small InfoBox/WarningBox here clarifying that "Data is not copied across for you, and needs to be manually set the keys if 'moving' between PersistentDataHolders."

[Machine-Maker]

Yeah, that does seem to be a common misconception, that itemstacks that create block entities have multiple pdcs, one for the stack, and you can access the block entity's PDC from that stack as well.

[NinjaMandalorian]

Sounds good, I'll work on the PR now.

[NinjaMandalorian]

Closed by #477