apparently, there is at least one blocklist that blocks version.bind
pihole -q version.bind
Match found in https://raw.githubusercontent.com/DandelionSprout/adfilt/master/Alternate%20versions%20Anti-Malware%20List/AntiMalwareHosts.txt:
version.bind
In order for the version check to work, you need to whitelist version.bind, or you'll get something like:
dig chaos txt version.bind +short 127.0.0.1
;; Warning: Message parser reports malformed message packet.
0.0.0.0