In-game estimator is very different from post-game estimator. In-game estimator is incorrect

[shinuito]

I’m pretty sure that’s entirely intentional.

See for example

[poll] Balancing the new AI score estimator

UPDATE: 2021-05-17T06:00:00Z (UTC) Thanks for all the feedback everyone. The new KataGo Score Estimator will not be made available in any form to players while playing a game, nor to spectators coming from the same IP address (so one can’t simply open another browser/private tab to have access to it). For the time being we will still allow players to use the old score estimator when analysis hasn’t been disabled, just like it’s always been. Looking forward, I think the longer term answer might…

Basically the old estimator (in game) could be ok in some situations, but if it’s dealing with anything complicated or uncertain, it’ll depend on how many playouts it does, and possibly even which playouts.

The post game one is Katago so it knows in some extent quite a lot of variations that could happen and will likely tell the status of stones that potentially even the players don’t know. It was deemed (probably correctly) to be too good to be allowed in game.