Lens flare is buggy

[omichel]

As it can be seen in projects/vehicles/worlds/highway.wbt, the lens flare seems wrong:

[fabienrohrer]

I can indeed reproduce this issue:

Some times, but rarely, it's working fine after reverting the world, or loading another world before:

This means it's caused by bad LenseFlare parameters (as I originally thought) but with a real bug. I have to check if this post-processing is applied in the correct target.