Merge pull request rails#24476 from vipulnsward/24314-eagerloading-doc-update

Document know limitation about using `references` in conjunction with custom select clauses [ci skip]

Author: vipulnsward

guides/source/active_record_querying.md

@@ -1251,8 +1251,9 @@ articles, all the articles would still be loaded. By using `joins` (an INNER
 JOIN), the join conditions **must** match, otherwise no records will be
 returned.
 
-
-
+NOTE: If an association is eager loaded as part of a join, any fields from a custom select clause will not present be on the loaded models. 
+This is because it is ambiguous whether they should appear on the parent record, or the child.
+ 
 Scopes
 ------