Seems linked to "Composite"
Try this :
Filter 4050, select the first "Composite" in the list and the four other Filters select the second "Composite" in the list.
The try the settings :
XOR : Frame=1, Background=1 Over : Frame=1, Background=1 In : Frame=0, Background=0 Out : Frame=0, Background=0 Atop : Frame=0, Background+1
Seems linked to "Composite"
Try this :
Filter 4050, select the first "Composite" in the list and the four other Filters select the second "Composite" in the list.
The try the settings :
XOR : Frame=1, Background=1
Over : Frame=1, Background=1
In : Frame=0, Background=0
Out : Frame=0, Background=0
Atop : Frame=0, Background+1