I think it was meant, but you can blame Adamzoneandtopmarks for making the bug or what ever it is known. They call it a nuke/Missle. I do hope they remove/fix it though, I think TNT carts are OP, and they need to be more like normal TnT.
Ok thank you, when I saw your comment I did some further testing and you are correct, but the weird thing is is that I don't remember it always being like that. Well thanks!
That report is focused on the shadows not being on the blocks, not under the blocks.