Custom Decorations not showing up in Ultimate Doom Builder

[Ludi]

I was making some custom decor for my WIP megawad, but I've run into some issues. While my new decorations show up in prboom+ during testing, they don't show up in the Ultimate Doom Builder map editor. This makes it quite confusing for me when it comes to decoration placement, and I was wondering if there is a solution to this problem? 

 

Appearance in prboom+um

Appearance in UDB

 

If it helps, here the newest version of my wad :^)

Harvester0.2.5.rar

 

[Mr.Rocket]

Rename your SS_START to S_START.

Since you have an S_END already, you'll need to have a starting point for that marker.

[Ludi]

It worked, thanks!