Yes, and I dont understand why - the GRO only 'sell' (licence) 1 version of the full Indices ?
Apologies if anyone already pointed this out, but I have noticed when doing painstaking quarter by quarter searches on Ancestry BMD that some pages do not appear. One big reason seems to be that where the original index was amended, extra names are sometimes added by hand at the foot of the page. Ancestry appear to have used the physical first and last names per page and not the logical ones
(made-up example) page starts with Bloggs and one is missing, at end of page under the list that is now maybe halfway through Browns, an extra Bloggs is written in and linked with asterisk to where it belongs. For Ancestry that page would contain only Bloggs-Bloggs entries so all those Browns and any names in between have disappeared from the index.
Once you are aware of it you can try a name before or after the one that you are interested in and get to it by using previous/next page options. It's a pain but the names and pages are still there, just not accessible directly via the index.