Artillery shells not exploring chunks

[fjgj]

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I was cleaning up a lot of biter nests with artillery. I fired some shells to explore the map and some did't explore chunks.
My game is some times very laggy, I had an ups of +-15.
I also use google drive to backup my save files.

I could upload the save file but here is a link its like 115 MB.
https://drive.google.com/open?id=184zBc ... A--MK7kPcu

[fjgj]

It wasn't a bug, the map froze up. All chunks are explored. Sorry

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