Bot base not visible

Product: Plants vs. Zombies: Battle for Neighborville
Platform:PC
Please specify your platform model. PC
Please provide your Xbox gamertag or PSN ID. (Optional)
In what game mode did the bug occur? Not really sure
Summarize your bug After a wave in Operations when the bot has been destroyed, his base didn't reappear This happens in the new Map, near the center during Zombies vs Plants(AI) (I think the map in English is called Oozeivoir(?) Not sure)
Steps: How can we find the bug ourselves? Try to let a bot die, and see if his base reappear
How often does the bug occur? Occasionally (10% - 49%)

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Here's the example: