[2.0][Launcher] Cache size error message

[BlackShark]

I updated Maniaplanet through Trackmania 2 Canyon.
In the launcher, when I go to the advanced settings and click OK, I received a mysterious error message

Enter an integer between 10 and 4095

The source of the error is not indicated so I couldn't figure out what exactly was the incorrect parameter, I had to try them all one by one, I found it to be the Maximum cache size parameter.

I then set it lower and started the game.
When the game started it detected that the cache was almost full and asked me whether I wanted to increase it to a value well above this 4095MB limit (it was around 5.6GB). I find it strange.