I could not see anything that looked like “bending”. This is likely a function of my computer setup. Rest assured someone who is far more qualified will come along shortly.
Unfortunately we cannot do a lot about that (only possible “fix” would be to increase the rendering resolution but it will be really expensive: https://playground.babylonjs.com/#WIMFD8#4
And anyhow you will see the effect by going farther
One tiny trick is to enable specular AA on the pbr material: https://playground.babylonjs.com/#WIMFD8#6 but this will not remove the moiree pattern just reduce aliasing.
Thank you very much for the two solutions. We avoid the increase of the resolution because of the performance and with the aliasing we had no noticeable effect in our application.
It could have been that I missed something.