Green blockers should not be visible unless the scene is being loaded

[olavra]

Green blockers should only be visible if a scene near you is being loaded. Right now, its even visible if you are close to an empty parcel.

The way to test this is to use the scene load radious to 2.

Acceptance Criteria

• A player will always collide with the frontier of a parcel that is not loaded
• The Green Blocker will only be visible if the Scene is actually loading