Grey output when connecting to headless backend via wayvnc

Since commit a6036105 only a solid grey output gets shown when connecting via vnc to a headless sway session running wayvnc. Input is processed though.

Before running sway I set

WLR_BACKENDS=headless
WLR_LIBINPUT_NO_DEVICES=1
WLR_RENDERER=gles2 #also tried pixman and vulkan

sway config used sets the following:

set $output1 HEADLESS-1
output $output1 resolution 1280x720 pos 0 0
exec wayvnc --keyboard=de -o $output1 -f 24 -p -r --gpu  #also tried no --gpu flag

edit: added debug log sway_vnc_debug.log

Edited Aug 21, 2023 by pp

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Grey output when connecting to headless backend via wayvnc