I was going to file this as something wrong with my laptop. But this is awfully specific. To reproduce the blue issue:
- Open firefox
- Go to playground from above
- Notice it is not blue
- Tab away
- Close firefox (keep tab open; but not active)
- Open firefox again
- Open playground
- The blue issue occurs
But to fix it, it seems, you just have to run the playground again.
Ah, good catch! I have just tried with 64x64 texture (https://playground.babylonjs.com/#53XBC3#1) and I cannot reproduce anymore. But the moment I switch back to the 512x512, blue again.
Just a minimal reproduction of what I thought was (or is, idk) a bug.