Mofifying shader code does nothing, but deleting it from the list works

[4A6F6F6E61]

Describe the bug

When I delete everything in every code block from a Shader, nothing happens when I run the game, but when I delete the shader in the list on the left the shader is gone. This also applies to modifying the shader.

Reproducing steps

1. Select Shader
2. Mofify Code
3. Run the Game
4. Nothing happens

Setup Details

UndertaleModTool version: 0.6.1.0
OS: Windows 11
Game: Private Game.