So it seems like the guys at Deezer are doing weird things when it comes to keyboard input. Specifically on the main search page, t9 immediately "loses" typed letters and starts a new word. Same thing also happens for abc mode, with only the first letter of a key successfully being typed, and subsequent presses resulting in the same letter. My guess is that Deezer just lazily re renders the entire page when displaying new search results, which results in t9 losing control over the text already in the field.

What could be done about this? A first crutch could maybe be to offer a compatibility mode for selected applications where text stays in a field owned by the keyboard app, before being inserted into the apps field. I reckon this is also probably the only realistic solution, given this is such a niche problem.