As Thomas Viehweger wrote, DVB support ist missing since upgrade to v 0.35.*. It can be clearly seen by executing mpv --list-protocols "dvb://" is no longer included. I searched all change.logs on Debian and also Upstream (https://github.com/mpv-player/mpv/releases) and I could not find any entry regarding removal/depreciation of dvb protocol. So it is definitely a regression and the severity of the bug should be raised to "serious".
Regards, Alf