Holes in protected areas.
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 It seems like the way that as newbie walls are opened up over time it leaves a gap. Here's an example: 
 https://screeps.com/a/#!/room/E55S50 (Screenshot incase it's not noticed for a while) 
 This newbie area does not open up for another 48 hours, however, it has a hole in it that I can pass through.
 I believe the problem exists when the four quadrants of a new zone are opened up. Here's an example where it's likely to happen again:https://screeps.com/a/#!/room/E55S40  
 In theory in 39 hours someone can invade this newb area, 10 days before the protection is up.
 
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 Thanks for reporting, fixed. 
 
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 All of W50S10 to W40S10 is missing its wall. So is W50N0 to W41N0. 
 
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 Additionally there is a whole at W51N50 that doesn't seem to have any applicable logic to it. It's just a room that decided not to generate walls. 
 https://screeps.com/a/#!/map?pos=-51.5,-50.5
 The giant missing wall that was mentioned above is here:
 https://screeps.com/a/#!/map?pos=-45.5,10.5
 It's a fairly impressive hole, a whole side to a novice area is just open.
 if (newWall.timer > existingWall.timer) { wall.place(x,y, newWall.timer); }
 
