What do blue square mean in scoring?

I think it’s related to this:

but either AI auto-scoring is not as smart as one might hope or it’s buggier than one might hope (or both)
e.g.

And on this point: (a bit off topic)

I thought there was some discussion about this maybe depending on players being on the game page at the time of the game ending - e.g. if both players are actually in the game page then autoscore is triggers but if not then it is not. it’s unusual I suppose for both players to be there in correspondence games but maybe not as unusual as you think if they both feel the game is about to finish and hang around to play the last move or two and pass.