I do wonder if the Richarlison one wasn't looked at because of the red card (which is mental, if so).
I don't think we've ever seen as big of a 'swing' with one VAR decision (from red card to one team to red card being rescinded and penalty to that team in one decision) and they're probably shy of doing something like that.
I think the reason VAR hasn’t done anything is because the ref is staring at the shirt pull and decides that’s ok.