Hi,
Here is the support answer for those who may face the same issue: 'Thank you for providing the scene. You just need to turn off the Limit to Visibility feature in the Camera rollout.'
I'm really surprised as most of the time I don't touch that setting, it works well with default settings in most cases (which is 'Limit to Visibility' activated), this is why I didn't think to check it, and actually I don't really understand what's going on: given the forest object is right in the front of the camera, there shouldn't be any need to turn this setting off.
So my problem is solved, thanks for that, but could you please explain a bit more why is it needed to turn "Limit to Visibility' off?
Thanks again,