It's probably just the anti-clipping setback for the Recluse model, in which case as it isn't a bug at all.
Unless you want reality to phase your character into solid rock. 
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It's the invisible Recluse arm or something similar. All the Arachnos stuff in RV doesn't disappear, just becomes see through.
There's a platform above villain base you can stand on regardless of who controls that area of the zone at the time.
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There are also some buidlings you can't "climb" because of the Hero/Villain alternate textures... and the Pillbox in the NE corner has some soot/debris in the corner near the war wall barrier that disappears at some point as well.. but your character looks like it's floating when you walk over it in it's alternate form.
Like others have said.. it's not really a bug, just a side-effect of preventing character clipping when the models switch.
You can actually see the invisible platform