The block double_stone_slab with the damage value of 8 has the "missing texture" texture and if you hold it in your hand it looks like a glass pane.
Steps to reproduce:
Do /give @p double_stone_slab 1 8
Place it.
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is duplicated by 1
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Comments 5
It's almost as if a massive number of blocks were converted from being hard-coded to using models, Preben.
Confirmed