Can't get Roon bridge or UPNP renderer to show up

[Snoopy8]

There's just too many players for me to monitor and there really isn't an easy way to automate this sort of testing.

Maybe it is time to cut down on the number of music players (and you have a request to add another one!) ? For a start, reduce the number of Squeezelite versions to a handful?  The older versions were causing problems which were remedied using V2 on SO 1.3

Yes, it goes against the SO philosophy of "music your way", but many of the issues during the testing of 1.4 were player related.  Alternately, automate the testing of the installation of music players?  It won't solve the issues of a specific player not working as intended, but at least, it reduces your workload.