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I wasn't talking about that... In the hero's stats (where the primary skills are), the new value for the number of Knowledge points won't appear after acquiring the base Intelligence. Although it would be logical. But the developers don't know how to indicate a parameter of 12.5 (I was talking about these fractions). So, they still leave it at 10. But mana doesn't become 100, it becomes 125...
There is no contradiction - it is the primary "Knowledge" parameter that increases, it just isn't displayed... Although all of this is just speculation that doesn't affect the main point. Everything is correct there...
P.S. Although, personally, I find the text "the well restores all of the hero's mana" more understandable than "replenishes mana up to 10*knowledge".
And even better: "the well restores all of the hero's mana, which is calculated according to the formula 10*knowledge"