Blender node trees support having multiple Material Output nodes present. Only one such material output node can be active at a time, signified by its red header - the active material output node can be changed by being selected by the user.
BakeLab2 currently does not respect whether a Material Output is active, using whichever Material Output it found first. This is not always consistent with how materials appear or are set up at the moment, leading to not-very-predictable behaviour if baking materials with multiple Material Output nodes present.
Blender node trees support having multiple Material Output nodes present. Only one such material output node can be active at a time, signified by its red header - the active material output node can be changed by being selected by the user. BakeLab2 currently does not respect whether a Material Output is active, using whichever Material Output it found first. This is not always consistent with how materials appear or are set up at the moment, leading to not-very-predictable behaviour if baking materials with multiple Material Output nodes present.