The entire premise for deprecating the UN tag on Commons is based on the "old" annex issuance which was superseded and then modified twice more. fwiw Here's the history (as of 2015, Part V. p. 34) in short...
- http://undocs.org/ST/AI/189/Add.9/Rev.1 March 26, 1985 (obsolete - had an annex at end listing certain types of docs that did [not] / would [not] be registered)
- http://undocs.org/ST/AI/189/Add.9/Rev.2 Sept. 17, 1987 (above annex replaced by 3 bullet-list of the types of docs excluded from copyright)
- http://undocs.org/ST/AI/189/Add.27 Nov. 8, 1990 (modifies instructions for use of copyrighted materials within UN publications - not relevant to discussion)