In the newest snapshot, there's a bug when placing trapdoors, namely that the texture is on the other side of the block then the hitbox (E.G. hitbox is on the right side but the texture is on the left side). It occurs when a trapdoor is placed, there doesn't nessecarily have to be a block on the opposite side of the trapdoor for this glitch to occur. On the picture below you can see how my character is on the trapdoor hitbox with the cursor, but the texture isn't there. The texture is normal when the trapdoor is closed, the texture is not on the top of the block or something.