I generated a buffet Snowy Tundra world, and found this right at the spawn. I created the world several times to see if it was just a onetime fluke, but no. The seed below is the seed with the glitched grass blocks.
-8843279254722522513
Go to the the coordinates in the screencaps, and you'll see them.
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Thank you for your report!
We're actually already tracking this issue in MC-132306, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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I've just tested this, Happens on Linux aswell.