timeline and video stop as the audio continue

Hi

I have this bug (attached video) that says "on the first visit you won't see the video" and when I click on the timeline again, the video is displayed normally.

The audio and video are separated and on the diapositive and not on a layer, they and the timeline don't have any trigger, the timeline doesn't have a landmark where it stops.

But I don't understand because even if on the capture I touch the timeline a first time to go faster, it does the same thing as if I let the timeline flow normally.

I never had this problem before today, this diapositive was created a month ago and worked well until today.

If anyone has any idea what's going on or how to fix this, I'd like to know, thanks.