Usually the fields _key and _uid are automatically created when creating a builder block.
By cloning a builder block a unique _uid field is not created, so the block has no unique identifier.
Closing this issue because this plugin will no longer be maintained, as its main functionality can be replaced by Kirby's built-in Blocks Field and Layout Field.
Usually the fields _key and _uid are automatically created when creating a builder block. By cloning a builder block a unique _uid field is not created, so the block has no unique identifier.