AdminPlugin failing in MyGet with "BeforePluginsLoaded" does not have an implementation

We recently (this weekend) started receiving docker deploy errors that trace back to this errors:

System.TypeLoadException: Method 'BeforePluginsLoaded' in type 'ServiceStack.Admin.AdminFeature' from assembly 'ServiceStack.Admin, Version=, Culture=neutral, PublicKeyToken=null' does not have an implementation.

It seems some changes were made Friday that might have caused this. Was this intended?

I’ve had to do a fresh rebuild of all CI packages, this issue should now be resolved with the latest v5.5.1 on MyGet, you’ll need to clear your NuGet packages cache to download the latest version.