Whenever the bottom block of a Double Tallgrass is punched, the texture of a Peony shows for a quick second then disappears.

Dupe of MC-53439

This is common chunk/block update lag. I experienced it too whilst playing on my server. Just ignore it for now.

Nope Marvin, this is completely different. Here's my guess... The top half always assumes that there's a bottom half below it, and will instantly update its own variant value to the variant of that bottom block. When you break that bottom block, it becomes air, which obviously does not have flower variant data. Since the top block doesn't check whether the bottom is actually a double flower bottom half, it tries to change to an unknown variant, resulting in it using the fallback variant, which for some odd reason is the peony. One tick after all this happens, the top half actually does realise that it's floating, and deletes itself.

Ok turns out that basically the top half never truly knows its variant.