Model not shown when root outside screen

I’ve hit a weird case with animated models in Unity.

If an imported model’s root is outside the camera’s viewing angle, the entire model is not shown.
As soon as any camera (including the editor’s scene window) looks at the root, the model is rendered.

How can I fix this issue?

Check your Culling Mask settings of the (or all) cameras and make sure that they will render (include) the layer that is set in ALL of your models Transforms (the whole Transform tree of your model). A model can consist of several transforms (i.e. if you have a bone structure) and they should all be set to the layer that will be rendererd by the camera(s).