Nothing is filmed in sync for tv and film, Barsel - it's not theatre. I think that aspect must be quite tricky for the actors, one minute they are bawling their eyes out because their loved has just died, next minute they are nagging them to do the washing up.
I don't know if you've noticed but Corrie and everything filmed recently has a lot of 'back of the head, over the shoulder' shots when two people are facing each other chatting. You see the back of the listener's head when the other is talking, then the camera changes to the back of the other person's head. It was very noticeable in Vera. That's camera trickery - they are really on their own during the chat, imagining the other person is there.
I think it is very well done, on the whole, coping with filming during social distancing.