Official comment
Bare trees and low overlap is a bad combination. You used 75% overlap on your data collection which is going to work on very simple scenes but any time trees are involved it is going to require more overlap. The Data Collection guidelines that are agreed to at the time of upload state the following:
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Use LOTS of Overlap in Treed or Crop Areas
Trees are hard to render because they are typically almost always in motion and have a lot of fine detail.
Generally, the orthophoto portion of the processing may turn out fine at 65-70% overlap. However, if there are trees included in survey area and you want the 3D components of the processing to turn out well, we recommend using 80-90% overlap in order to make sure we have enough information to represent the trees properly. Bare trees are extremely hard to reconstruct well due to the complexity of the branches and shadows. Extra overlap should be used but even then it can be difficult. Also, avoid windy days when trees are involved.
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The areas that turned out for you are the ones that included the road area which is a simpler scene. As soon as the low overlap got into he trees it fell apart.
