There is a newer mod in the Giants Mod Store of a Open Chicken Coop. That mod uses the exact same name as this one (even though this one's been out for years before that one) and Giants thinks you have the mod that's listed in their mod store. Because of that it triggers an update available. If you let it update, it installs that one and overrides this mod.

This mod no longer shows up in my game even though it's been installed forever. Did a FS update break it?

Good job, nice chickencoop