I need to properly look into it but it's likely I've not hooked up stream title updates to trigger an atf update for main playlist items & it's instead just using what the stream is providing as part of the "i've got a new title string to show" message. The custom atf option for the song ticker working is useful to know as that at least indicates that the plug-in doing the streaming is able to provide what's wanted but not good that you've had to do that when it should be just pulling in what's been generated for the main playlist item. Will look to improve things for the next build (no eta).
[edit]
I've now got a fix in place for the next build. It was already meant to be trying to do what was expected but I'd put in a validation check ages ago for some local file issues which was incorrectly being applied to stream updates which prevented the new atf based string for the stream being applied. That also updates the song ticker but you can keep using the custom atf for it if that's simpler when the fixed build is provided.