Interesting issue with the Food Spoilage mod. I seem to have an issue where the cooking magazines are spoiling. I tested with only your mod, and it didn't happen. However, with sCore installed, it does. So I added a line
<remove xpath="/items/item[@name='foodSkillMagazine']/property[@name='Spoilable']" />
Also, with sCore, it gives
WRN XML patch for "blocks.xml" from mod "khzmusik_Spoilage" did not apply: <setxpath="/blocks/block[@name='ConfigFeatureBlock']/property[@class='FoodSpoilage']" (line 4 at pos 6)
I know it is not your mod, but something slightly goes weird with sCore mixed in. Not your problem, but a lot of people do use sCore.