Thumbnail Preview is invisible if the filament color was set black in the slicer

[Abesbeard]

Hello, i use an Ender 3 V2 with updated DWIN Display. If i load the Testfile SimpleCuraTest.gcode the Thumbnail ist shown in my DWIN Display. I use Cura 5.9 with the recomended (professionalfirmware.py) script and set this in Cura to 190x190 and it produced a G-Code like that, but didn´t display a Thumbnail in the preview beffore i start printing?

;Generated for MRiscoC Professional Firmware

;https://github.com/mriscoc/Ender3V2S1

;===========================================================

;FLAVOR:Marlin
;TIME:1714
;Filament used: 1.17049m
;Layer height: 0.2
;MINX:90.25
;MINY:83
;MINZ:0.2
;MAXX:144.75
;MAXY:152
;MAXZ:4.6
;TARGET_MACHINE.NAME:Creality Ender-3
;POSTPROCESSED
; [professionalfirmware]
;Generated with Cura_SteamEngine 5.9.0

;

; thumbnail begin 190x190 2464
; heres the G-Codde for the Thumbnail, wich i did erase for a better Overview.
; thumbnail end

;

After that comes the G-Code for the Object.

Maybe somebody can help me to find my mistake. Thanks a lot.

[Abesbeard]

I ve got the awnser in another Forum, it was the black PLA color in Cura. I changed the color and as a result i can see the Thumbnail!. So i will close my question shortly after i put it in there. Maybe it will help other people.