That's weird, I genuinely have no idea. I checked my WebGL settings, I have "WebGL Developer Extensions" and "WebGL Draft Extensions" disabled. For "Enables Display Compositor" I have it in default. The last thing I can think of would be check if your browser has "Hardware Acceleration" enabled.
I'm sorry, I don't have any ideas how to solve this if what I mention above doesn't work.
Are you using AMD gpu by any chance?
