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
[0.12.0] Concrete/Bricks glitches terrain
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Re: [0.12.0] Concrete/Bricks glitches terrain
Remember to check the resolved for next release subforum when posting a bug report.
https://forums.factorio.com/forum/vie ... 465#p92501
https://forums.factorio.com/forum/vie ... 465#p92501