Censys expands queries to provide additional functionality. For example, the query a:zmap.io
executes a DNS lookup and expands to ip:141.212.120.90.
Your query was changed from:
parsed.tbs_noct_fingerprint: 47ae6a2bad2d2610f3854fd42ba69d50351b798d83f31ede02460e44078b9fe2 and precert: true
to
parsed.tbs_noct_fingerprint: 47ae6a2bad2d2610f3854fd42ba69d50351b798d83f31ede02460e44078b9fe2 AND precert: true
If this isn't what you intended, you can run your raw query without expansion.