I was placing loads of endermen messing around when i realised they started to pick up a block with no texture, some picked up dirt but most picked up the block in the image attached
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Duplicate of MC-56898 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.
This means there is a broken texture or the game cannot find it.