Replication problems happen when using a custom schema without msDs-IntId.
Created attachment 11912 [details] Patch for v4-4-test
Created attachment 11913 [details] Patches for v4-3-test
Pushed to autobuild-v4-[4|3]-test.
(In reply to Karolin Seeger from comment #3) Pushed to both branches. Closing out bug report. Thanks!