Since the version update on 04 December 2015 when walking on a planet at a low altitude the terrain completely disappears on that plate, in order to get textures one has to be 4 blocks or more up and even then they tend to disappear for some reason.
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-confirmed-
depends on viewing angle
2015-12-05-1029-01.flv
you also can not see anything inside the core while in build mode
2015-12-05-1046-44.flv