I cleared the Chrome defaults, so that when I opened up the URL, it would allow me to select the default app---and I only got Chrome and the system browser as options, no Talkbass. So I think that Talkbass does not recognize the new URL format, and it's the app that needs to be updated.
When I Google "android open url with app" I get a bunch of developer websites about "intents" that can be set when coding apps. Like this. I cannot find any information on how I can do this as an end user on an unrooted phone.
So I really think the problem must be with the app, that it needs to be updated to reflect the new URLs. I'm surprised no one else has complained about this. I can't imagine I'm missing something obvious, but if I'm missing something non-obvious I would be happy to hear it.
Ahh, I see. Ok, let me look into this. Thanks for troubleshooting this.