Also happens when a horse, donkey, mule or cow is riding a turtle and the turtle touches water.
As it turns out after some testing, it's a different bug entirely; what's shown in the screenshot happened when dead_coral got split into the 5 different types of dead coral blocks. I don't see that as reported, and frankly don't know if it's a valid bug to report.
Confirmed. I had to downgrade back to 14w25b to use my map.
Confirmed in singleplayer.
Possible cause: Item frames are some times placed inside the block but rendering outside, causing the black frame effect and the bug Early Reflections mentioned in a comment.
The developers can't fix the bug with this little information. Please provide a description of your problem and how to reproduce the bug.
Yes, this seems to happen when you move the scroll bar while having the pointer outside the bar.
Oh well, thank you Dinnerbone. I expected it to work as it is a TileEntity, but that does not matter too much.
Reproduced.
Confirmed. Also reproduced on survival (Really hard to reproduce, but happens by adding and removing the disc quickly).
Working as intended as far as i know. For obligation, since a 1.5 snapshot (Can't remember what one) it has to have the animation text file (Which determines the speed of the frames)
Confirmed for 1.15.1
The reason the paintings near ceilings pop off is that whenever there's a change in the painting's NBT, it teleports its bottom left corner to where its center is. This means paintings larger than 1x1 will teleport up and/or right with every data change, often into blocks. However, because of MC-81870, the client don't see it teleport.