Adding to this
The disappearing pillar in the custom dojo courses also disappear when in the dojo, unlike all other disappearing objects that only function when doing the course. This makes working with them hard since touching them require a reset of the dojo, if you want to move them.
And since you are looking at dojos please fix the lasers in custom dojo courses, they go through everything, creating massive lag and breaking many courses. I suspect they also go through the walls of the room just by the sheer amount of lag created.