As usual, errors that shows up in your editor version 10.0.4 related to terrain shader is an indication that it’s time to upgrade to version 10.0.5 if you are going to work on Farming Simulator 25 mods. The game itself was patched up to version 1.9 and may require you to change the modDesc version if your mods are available through the game’s public ModHub at https://www.farming-simulator.com

The new version of GIANTS Editor can be downloaded at https://gdn.giants-software.com/downloads.php (requires user registration).
Improved saving times
Whatever new features added to the editor, the saving time for larger maps have improved. The terrain brush also loads much faster. That’s positive news for the project.