dnsmasq answers on the interface, not on the address
The gateway pings from inside the container and its DNS never answers. I got the diagnosis wrong twice, and the second time it was my own test that was lying.
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udm
A UniFi firmware update wipes everything except /data
My container had been dead since the last flash, because the flash took /usr and /var with it. The boot hook that puts it back cannot download anything.
Technitium DNS in a container on a UDM Pro Max
The UDM runs Debian and systemd, so it can run an nspawn container. What it cannot do is let that container talk to the router it is attached to.