Piston Pushing Lit TNT Creates a Phantom TNT block

If you power a block of TNT and a piston pushing it at the same time, it creates a glitchy phantom tnt block, that disappears as soon as the real TNT explodes. Image: https://twitter.com/Creeper0108/status/230531701628104704/photo/1 (Twitter link because I tweeted this a while ago, and didn't feel like hosting the image again)