...and it's my fault. 
Anyway, I have a fix at #4679 Multiple self-referencing eager loads don't join properly - Ruby on Rails - rails. Two lines of code, and a a test. Sorry!
-Ernie
List,
It's been a couple of weeks with no eyes on this simple patch, so I thought I'd ping the list again in the hopes that someone could give it a quick once-over. Thanks in advance!
-Ernie