Factorio Forums

This is kinda random and hard to reproduce, but sometimes, when you're placing tiles near water, water bodies may shrink. And when removing tiles that covered water/were near water, water may pop up in random formation, or disappear.

EDIT Here are some results

Remember to check the resolved for next release subforum when posting a bug report.

https://forums.factorio.com/forum/vie ... 465#p92501