I have an HP wireless printer on my network and its hostname is HP<12 digit hex string>. mDNS is running and I can ping the printer with
$ ping HP<hex string>.local

I changed the hostname on the printer to be just "Printer" but I still have to use the old hostname to ping.
I did some research and found that I should be able to see the mDNS names with avahi-browse. The first time I used this command I got a list of service names but since then all I get is an error:
$ avahi-browse --all
avahi_service_browser_new() failed: Invalid service type

Some more research led me to this thread: https://github.com/avahi/avahi/issues/212 which shows that there is a long standing  bug in avahi wherein it stops after encountering a device that sends a malformed service announcement.

So I have a couple of questions:
Am I correct in thinking that we have to wait for upstream to fix this?
Does anyone know of a way to determine what is sending the malformed service announcement?
Is there a way to update the mDNS cache manually or some other workaround so that I can use ping Printer.local?

Steve.