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Those two buildings may be pointless now, but who knows what they'll do with them in the future (if it's another mini-game...). The doors don't open because what they intend to do with them hasn't been added to the game yet.
As for the gun glitch you mentioned, it's nothing major (assuming that this is the same glitch). When you switched ammo, then switch back, sometimes the game may think you have no ammo selected. A simple fix to that is select another type of ammo. If it's a different glitch (or the same), just report it.
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