@SqueamishNerd @crinrict This is still occurring. Just ran into it. hovering a gate over a fence will glitch the fence and it will vanish. The resulting area cannot have fences placed. It is PERMANENT on that lot until the cache is wiped. Bulldozing the lot, wiping it and placing new lots won't fix the problem. Only wiping the cache will cause the fences to re-appear.
@Teknikah 's fix works, but the glitch causes other areas on the lot to glitch as well. Areas that never had fences placed. Better to wipe the cache.
It seems if you take a gate straight out of the build mode menu and hover over a fence, it will glitch the fence. If you place the gate first then move it into place, it will work fine.
Demonstration: https://youtu.be/OeH01ZtuXt4
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