I’ve pushed a fix for this bug so hopefully it will not cause anybody else any further confusion. Thank you again for bringing it to our attention.
As an aside it is worth noting that data processors are applied in the order you add them and do not commute (i.e. the order matters). In other words in the above case you would be trying to compress encrypted data. As the encryption should be pretty good (AES) the data you’re trying to compress will look basically random and the compression step will not shrink the data size (it will actually probably increase it).
In other words always make sure you compress before you encrypt.
Regards
Matt