Same problem with the rugby this afternoon
An update: we are able to reproduce this ourselves and are working with Google to find a fix.
An update for you:
I have to say that the adverts are very well synced, normally with digital adverts I get the odd one cut off but they seem perfect times for the break between the broadcast, I had no idea I was seeing digital adverts but that’s explained another issue I was having which is why are the lip sync on the adverts out of sync but the broadcast lip sync fine.