[2019] Animal pen disappeared and took my rock noses with it

Hello @StarKiller, thank you for reaching out!

Can you share a screenshot of the event log with the decay message?

Did it occur after a server restart or upon you entering the area?
Was the decay timer checked regularly and did it present consistent values?

As others have suggested, it’s ideal to place every structure on top of foundations to ensure that the decay timer is shared between all connected building pieces, which does prevent this issue.