Data Driven Blocks no Longer Function,

In the past few beta builds, any data-driven blocks that were added by an addon no longer function. They are not present in the creative inventory and they cannot be given with the /give command. Additionally, any worlds that previously had custom blocks placed in them would have those blocks deleted when loaded in the current beta. If this is a result of changes made to the way blocks are coded, these changes are not documented in the add on documentation pages.