I am using both InDesign Server and InDesign Desktop.
Server 11.0 and Desktop 11.0 have a bug with scale transform functionality. In Desktop 11.4 this bug was fixed.
Can I be sure that this bug is fixed in Server 11.4 without installing it? Do Adobe include such engine fixes into new version of both products?
unless one of the badged Adobe employees stops by, perhaps noone here can answer that question.
I cannot tell, if Server and Desktop are always on par with bug fixing.
Hm. Since the service for opening newer document versions in older InDesign versions is using a Server installation behind the scene and if we can assume, that this Server version is the latest version available for Server customers, maybe you could try to open a newer version document with an older version to find out what Server is doing. But this would only work if the bug can be fixed by opening and saving a document (to IDML) with CC 2015 v188.8.131.52 .