I admit, I do not plan on updating the map any further, so I will post any known bugs below.
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At the fountain, face the empty parking lot with the tall, blank wall on the end. That wall has ~50 copies of itself, in itself. You should definitely delete the extras.

There are tiny slivers of wall across the map where the skybox should be. Example: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=461216440 These slivers should have no impact on performance.