Font disappearance between TL 2012 & TL 2013

[Taylor, P]

Trying to identify why the Lexicon of Abbreviations & Ligatures in Greek Minuscule Hands compiled without error in 2009 and will not do the same in 2019, I performed a binary search on all TL final releases within that period and have identified the boundary as being 2012/2013.  Can anyone recall (or is it documented anywhere) why ugmm8a.pfb was present in TL 2012 and not in TL 2103 ?

Philip Taylor
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(see the transcript file for additional information){c:/TeX/Legacy/2013/texmf-d
ist/fonts/enc/dvips/ly1/texnansi.enc}<c:/TeX/Legacy/2013/texmf-dist/fonts/type1
/public/amsfonts/cm/cmmi10.pfb><c:/TeX/Legacy/2013/texmf-dist/fonts/type1/publi
c/amsfonts/cm/cmr7.pfb><c:/TeX/Legacy/2013/texmf-dist/fonts/type1/public/cbfont
s/grmn0900.pfb><c:/TeX/Legacy/2013/texmf-dist/fonts/type1/public/cbfonts/grmn10
00.pfb><c:/TeX/Legacy/2013/texmf-dist/fonts/type1/mathdesign/mdugm/md-gmr8t.pfb
>
!pdfTeX error: pdflatex.exe (file ugmm8a.pfb): cannot open Type 1 font file for
 reading
 ==> Fatal error occurred, no output PDF file produced!

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