As soon as the visibility tool is used, we're adding references to the "/Engine/EditorLandscapeResources/DataLayer" asset from landscape components.
If the user decides to cook without editor data, we ignore all assets whose paths starts with "/Engine/Editor". Warnings will be outputted, but the map can run without issue.
There are a few possible solutions to remove the warnings:
1) Remove reference to this layer during cook
2) Rename this layer to something else (/Engine/LandscapeResources/) so that it ain't treated as editor data anymore. A solution will be needed for existing data.
Will result in the following warnings during cook:
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-93414 in the post.