I have now installed and tested 37.1.generic. With the new Opera version I can watch https://www.br-klassik.de/concert/ausstrahlung-775304.html in fullscreen mode but the browser is otherwise pretty much unusable: the application can only be controlled with a connected mouse and replay controls (pause/resume, backwards/farwards) immediately freeze 37.1.generic. Streams of the Wiener Staatsoper cannot be decoded with 37.1.generic (the same streams can be decoded fine in Opera 32.0.2036.0). Summing up, 37.1.generic is not usable in Androis TV, unfortunately.
Well, few weeks ago when Canary 56 was arrived that browser crashed too and YouTube update start to mimic the same behavior. The only problem with Opera browser was with first version of Opera 29 when crashes come out.