On connecting land edges between a worldmap and its outermesh some script raises the outermesh to crudely mirror any terrain bumps in its parent worldmap at their margins. This is working perfectly in the 1.6.5 editor as can be seen in the following screenshot:
However, in game the same map grows massive icebergs in the outermesh due to a bug:
Closer inspection of this spike shows it growing but dwarfing a matching bump at my worldmap border:
However, this spike lacks a triggering bump at the edge of my worldmap:
BTW for clarification the outermesh is Calradia's as opposed to a custom one.