Factorio Forums

See the screenshot. The concrete has not yet been placed, and the preview appears over the the bottom half of the turret. It also occurs with "blue" previews, if there is concrete there already.

Thanks for the report,

I can confirm the issue:

Fixed for 0.13.9

I also just noticed it happens with inserter bases, rails, and parts of the train station.

... and over belts, and items ... those will stay under the preview.
We want you to actually see where are you placing it, so maybe it should draw even over buildings.
Train stop and inserters cases are kind of ugly, but their bases are drawn in too low layers, so I won't fix that.

There is a similar thing with the range indicator for turrets, which is rendered over their own bases but under their own barrels.

Perhaps it is a good idea to just render these previews over everything, to avoid the "problem" altogether.