That is a mod conflict. Any mod with a dedicated desity_height.xml will mess with heightTypes. So the problem is not from my map edit.
Viewing post in Last update (hopefully) v.2.2 comments
To make it easy on search, think which mod adds some sort of bulk material that is not in the game, or in my map. To make a bulk fillType you have to register it to a densityHeights.xml and the base-game xml used is with 6 channels instead of 7 (Giants should have set as base-game 7 chanels for densityHeights, but they chose not to....)
I have over 700 mods. These 3 caused the issue with the alfalfa and clover.. ( both of our map edits)
Grain Dryer Production
https://www.farming-simulator.com/mod.php?mod_id=314888&title=fs2025
Small Corn Dryer
https://www.farming-simulator.com/mod.php?mod_id=311316&title=fs2025
Rice Harvest Mod
https://www.farming-simulator.com/mod.php?mod_id=312410&title=fs2025
Apple Tree
https://www.farming-simulator.com/mod.php?mod_id=318334&title=fs2025