@SimGuruModSquad -- IIRC you've asked us to report when CC doesn't work with the high bit/s set in the ID: I just realised this is the case with CWAL 0xD5F0F921. With a group ID of 0x80000000 the catalogue thumbnail won't generate; when I set the group ID to 0x00000000 that solves the issue. I haven't done anything with walls in a while so I can't tell whether this is a new(ish) phenomenon.
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Not a piority to change anything on your side, of course -- just thought it's helpful for others attempting to fiddle with craftables.