Found out why it could be like this; try using golden quality beans with the golden kegs! For iridium the same and possible the silver ones too- In short; Match the quality of the beans to the kegs; gold beans-gold kegs
Just tried the mod, and I think it looks at the first slot it can find ingredients in and tries to use that. If slot 7 has 30 fruit and slot 8 has 999, it will try using slot 7 and complain that it can't.
I don't know what is causing this since I have only quality of life mods installed (skill tracker, show sell price, etc), but sometimes the kegs randomly stop working. I placed three of every type next to each other inside a shed, and a regular keg outside to track the process. The regular keg was done, but the modded ones weren't. On the next day, only 2 iron and 1 gold kegs were done, and the other ones... well it's been 13 days and they're still doing the animation.
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In short; Match the quality of the beans to the kegs; gold beans-gold kegs
(translated by google translate from portuguese to english)