I cannot find anything to explain this.
I did notice that the 2010 version of the standard (MRI) has been amended and replaced by a 2013 version, in the IEC webstore.
To speculate:
it could be that the earlier version has been removed, with the plan being that the new version would replace it. However, the new version may have been blocked from OJ publication, by objections. These have affected other standards, with the objections being that the new standard "does not necessarily show compliance with all of the Essential Requirements of the MDD".
These difficulties seem to be occurring as the responsibility for the management of the MDD has been transferred within the European Commission.