New KB article 932862 was published yesterday to discuss issues which may occur after applying BitLocker schema extensions in Active Directory forest under some conditions. As this KB states:

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This problem occurs if the following conditions are true:

The Active Directory domain that includes the BitLocker Drive Encryption schema updates contains Windows Server 2003-based domain controllers.
One or more of the Windows Server 2003-based domain controllers are configured to use one of the following language locales.

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This article provides whole list of language locales which may cause a problem as well as some workaround procedure (which is instruction how to remove index which is causing this issue). Worth checking before extending schema for BitLocker recovery support.