Tried to again recreate the situation I had in the first post to the letter.
start in nonvr first (fixes and everything as decribed in my edhm method, cleared shader cache and deleted gpuworktable before that start.)
planet is looking fine in non vr.
Went to vr to see the state of my initial post. it didn't look like the first problem just like a texture is missing for a quarter of the planet.
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set permitnativedoubles="true" restart in vr. and get the orange sidewinder
set permitnativedoubles="false" restart in vr. still borked went to try to land.
hmmm... still no change probably all useless what I did before? the steps that I tried for 3 slight different vairiation seem useless.
went close to the surface near bugged area. logged out close to the surface
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deleted gpuworktable (no shader cache cleaning.)
restarted in vr
I see terrain where there was none before!
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Then was unable to find any problems with bletones 2 a or any other landable planet thin atmosphere or not.