Beta 9 looks like it is still having issues with the US1940 Census.
This time it looks like it is failing some of the Census entries with four digits in the Roll, and those with a Roll reference that begins "M-T0627-0" (those are zeros as opposed to small "o"s).
For example (off the scroll):
Record 292 of 440: US Federal Census 1940 - Failed to add I03615: Cleo Reynoldson b.28 FEB 1900, Roll: 1141, ED: 8-18, Page: 1B.
Record 295 of 440: US Federal Census 1940 - Failed to add I12120: Ralph Kelly Murray b.13 SEP 1924, Roll: M-T0627-00046, ED: 37-111, Page: 1B.
Record 317 of 440: US Federal Census 1940 - Failed to add I06949: Leone Reynoldson b.15 NOV 1927, Roll: 2236, ED: 6-17, Page: 4A.
I also had no luck again with the Canadian census from 1880, but I presume that is simply because Ancestry does not add the applicable information into the citation.