CoronaMix wrong falloff thumbnail in mtl editor Corona 1.6

Hi.

Corona renders wrong thumbnails for falloff-map, connected into a CoronaMix in material editor (slate/legacy-sht). I don’t care about legacy mtl editor, but the thumbnail is wrong, when it’s connected
into a CoronaMix(right), and okay when the falloff-map is connected to nothing.

edit: Tested under 2016/2018