Food from rockets can't be composted

I've tagged Grubfruit preserve thats's in a fridge in a rocket to be composted but no dupe is willing to take it. There is no task. Even a move order (from a mod or ingame - i don't know) doesn't know. I've got idle dupes with no priorities. The rocket is accessible to everyone. it's been used many times. Does anyone have an idea what to do?

EDIT: So apparetly the move order worked and the food didnt spoil in the rocket but despite that it still lies in the spot where i pointed the dupes to, still tagged as "compost errand" and nothing. I'll try it with other types of food.