Dnsmasq not responding to some some DNS queries

[Lu]

I have a printer that makes DNS queries like any other device, mainly to reach machines on the LAN, but also to 3rd party services on the Internet. From what I can tell, Dnsmasq on OPNsense flat-out refuses to answer its DNS queries. I've done packet captures on the OPNsense device, to compare requests from my own machine with those of the printer's, and I don't know why they go unanswered. It waits and asks again with the search domain appended again, defensive-programming-style. I don't see anything blocking them when I watch the live view of the firewall when triggering queries from the printer.

Does anyone have any ideas about the cause, or what else I can do to diagnose it?

As a band-aid solution, I've had to configure it to use static IP addresses instead of names to get basic functionality, but that isn't sustainable.