Print and Cut feature doesn't work with masks applied to image

I’m trying to use print and cut tool for “dual-side” engraving.
It works well until I have image with mask applied (mask is offset of the traced image itself). It allows to save some time and plywood by not engraving parts which will be cut out anyway). With mask applied once “print and cut” points has been selected preview shows that the mask moved correctly but image stays at place thus moved mask applied to the image which off and the result is terrible. Without applying the mask everything works like it should.
Is it bug in the LB or am I doing something wrong here?

Flattening a mask should do the trick. I have to read the docs sometimes…