Sentence mode in video course - audio plays from start

I just noticed that in a course with video and audio (slow ukrainian) when I hit sentence mode I still get the full audio/video playing from the start. Another audio only from the same course was fine…

Is that on the website version?

No, the android version.

I also noticed, after pausing audio to look up a word in the text, the audio restarted itself. Dunno if this is connected to the issue with the sentence mode.