V6: Turn on off groundplane affects drawing of mesh

Here with groundplane ON:

And with it OFF:

Se how the terrain against the wall is drawn
and how the terrain obscures the white line too.
(It is visible as it is a raised geometry)

Ground OFF:

Ground ON:

So something is going on.

This is the BETA
(6.0.18012.13241, 01/12/2018)

I’ll upgrade to the release version during the weekend.