Bug report : Stacking effects using IPCB fader.

Hello,

Bug report in v4.2.0

Launch new show, then patch one Halcyon.
Create following lists >
 List 1 cue1: circle effect as size 10 degree.
 List 2 cue1: circle effect as size 10 degree.
Change fader settings to IPCB crossfader (only list 2).

Play List 1, then up fader of list 2. The output result is a 20 degree effect. In v3.21.0, it is 10 degrees as expected.

Thanks,