map editor: Map corner pivots causeing map breaking

System and game Info:

• OS: Mac Os X
• El Capitan
  
  • 8 GB memory
  • 3.2 GHz intel Core i5
  • AMD Radeon R9 M390 2048 MB
• Game Version: v1.4.0f111
• Player.log

Within the map-maker I believe I have found a bug where when I use the Corner pivots mirror tool I have encountered a bug in where the upper half of the map has stopped loading the map after saving and quitting, and then reloading the map. I have inserted screenshots of the options screen for the original creation of the map, a before saving picture, an after saving picture, and a image of the mirror tool I used.

Incase the images don't work:

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Screen Shot 2016-06-12 at 6.09.34 PM.png

Screen Shot 2016-06-12 at 6.11.35 PM.png

Screen Shot 2016-06-12 at 6.10.19 PM.png