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Yes, food that can't be stored in a warehouse rots at an increased rate.
An unfortunately the granaries are now subject to decay
Why do you say that and what do you mean by that?
Granaries have broken down due to low production.
Now that is strange. What is the EXACT message, please? Because, you know, Granaries aren't production dependent at all.
Realm Report for D'Hara (27 days, 19 hours ago)message to all nobles of D'HaraDesert of Silhouettes The last Granary has broken down due to lack of maintainance and repairs.
Ah, yes.Granaries won't stop working because of production or something else, but you do need to keep them in repair like all other buildings, yes.