You should not mix Beta / Early Access with Production. Things like this will happen. Either switch everything over to Early Access or leave everything with Production releases.
Early Access information is here:
It is easy to switch Android remotes to Beta in the Play Store without realizing that this will at least occasionally require a RoonServer from Early Access as well. The Play Store description of the Beta does not point this out, or at least I can’t find that info either. I have alerted Roon to this potential confusion here: