If you place vertical cobblestone in the void in the end (and perhaps other gray looking blocks, wouldn't know), and create a map, the cobblestone will not show up.
NOTE: Only affects the void. Works perfectly fine if you place on an end island.
MC-215131
Vertical cobblestone doesn't show up on end map in the void
Resolved
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We're tracking this issue in MC-113292, so this ticket is being resolved and linked as a duplicate.
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