Fence clipping (1.16.221)

I was in my sugarcane farm and I made it the walls of trapdoors. to place a lantern I placed a fence in the top. I decided to use the trapdoors to climb to the top. Then I opened the trapdoor of the fence and went into it. When I closed it and I was inside the fence, the hitbox altered and left me sitting in top of the lantern.