Advantages of Mages over other races.

At the same time, by increasing knowledge or finding a couple of extra artifacts, you can sell the mini-arts and acquire new ones – there will be no loss of resources in this case.

That's why I got this result:
... I entered a castle after traveling and received a message (similar to how a stable adds turns) saying "mini-arts have been updated"... and after I sold/bought artifacts, I received another message saying "mini-arts have been updated"... it seems that in 3.0, mini-arts are automatically updated when visiting a castle with a built "mini-art forge"... which wasn't the case in versions 2.1 or 1.6... I wonder, if I leave the castle and remove artifacts from the map for knowledge or add them, will the effect of the mini-arts increase/decrease or remain constant until the next visit to the castle?