I made a simple template here https://cables.gl/p/ztMhx2 but it turns out, that the texture is not showing on the first load. Once you manually update the canvas, e.g. through resizing or going to fullscreen and back, the texture appears again. I stumbled across this in another patch of mine which uses Pixel Projection / Force Aspect Ratio as well, so I guess, the bug is connected to one of those two ops.
Using windows 10 64bit, Chrome Version 80.0.3987.122