There was only 1 comic printed for this (a #1) which is listed.
It looks like core ALSO lists a 2nd #1 and a 2 & 3 which appear to all be the digital comics that were collected to make the single printed issue.
I’m not up on the current CLZ policy about listing digital comics in core, maybe this is OK, but the extra #1-3 on this series don’t seem to be identified as digital books.