Using old superflat codes/presets ("version 2") with multiple layers ("x") leads to unexpected behavior.

For example, when I enter "2;10x1;1;village" (which is a valid pre-1.8 preset containing 10 layers of stone) and click "Use Preset", it initially displays the layers correctly. But when I then try to start the game, it falls back to the default "Classic Flat" preset. And if instead I open the preset screen again, it shows the current code as "3;10x1;1;village", which is invalid due to the change of "x" to "*". Closing and opening the preset screen once again also resets the code to "Classic Flat".

So it seems to me there's something wrong with the conversion from version 2 to version 3 codes not handling the recent change from "x" to "*" for multiple layers correctly.