Pi-hole running on Raspbian, everything up to date. Pi-hole v5.4, FTL v5.9.
Enable blocking in the GUI, expect blocking to stay enabled
It immediately reverts to disabled. Nothing logged in the pihole logs, pihole continues to respond to DNS queries and DHCP requests, albeit without ad blocking. After running "pihole -g" in shell, it finishes with:
[✗] Pi-hole blocking is disabled