Landscape hole material using half the lanscape

For some reason I’m having issues with my landscape. If I place the material, with nothing in the "hole"selection, then only part of the landscape uses the mat. Placing the hole material in it’s selection will fill out the remainder of the landscape. (see attached screenshots)
From there it gets even stranger. If I use the same mat with the opacity setting for the normal mat and the hole mat., no holes will show up.
recommended that I post this here, as he was able to see several other bugs that I have come across.

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Hey ,

Thank you for posting this. While I was able to reproduce this in 4.7.6, it looks like in 4.8 this error has already been corrected. I tried several variants of the visibility mask we ran over yesterday and none of them produced the same error.