I just bought these ear buds, and like the sound quality, but have noticed if I try to use Google Assistant through them (for instance, to play audio on Spotify), the buds capture my command and activate Google Assistant, which correctly interprets my command and replies (e.g. "okay, playing XYZ on Spotify), then starts the requested app (e g. Spotify) and behind playing audio - shown by the track progress meter, but the buds do not play any audio.
What's more, from that point on, until I disconnect (forget) the buds in Bluetooth and re-pair them, they will not play any audio from any source.