Issue with saving campixel png with GLMakie

[jebej]

• GLMakie v0.11.2
• fresh temporary environment
  -Windows 10 with Nvidia GPU

using GLMakie
x = rand(30, 40); x[1:3,1:3] .= 1.0 # to help see what is happening
scene = Scene(camera=campixel!, size=size(x))
heatmap!(scene, x)
save("out.png", scene, size=size(x))
heatmap(x) # to compare

This issue is probably related to issue #4793 but the result is somewhat different, and specific to GLMakie. Here as well the png output looks clipped at the top and right edges, but even more importantly the values are all wrong and look like they were all interpolated from on row to the next...

left, png opened in paint.net, right, GLMakie viewer: