Map icon: normal bg with unique icon overlay

I've got this corrupted map from Vaal Temple. As one can get corrupted items there, apparently I've got Mao Kun which got corrupted and changed to Shore Map. In result the icon is stuck between two worlds: standard map background (that gray thingy) + Mao Kun demon icon on the foreground. It can be seen in the inventory - 2nd column from right.

Bug # on the screenshot.