New Enemy Discovered in Super Mario Bros.: The Lost Levels 3-1 (After 34 Years)

I never knew that this enemy was here and it isn’t shown on NES Maps either. ( ) It can be seen in a level editor of smb2J, and this discovery has now been documented on The Cutting Room Floor, which is a website that documents unused and cut content from video games. (Famicom_Disk_System) As this koopa spawns at the same height as the floor, and just one block to the right, I wonder if this was