Does anyone have any suggestions why commit:

https://github.com/TEIC/TEI/commit/672a64aa68080154242a8c27e19644a88afb9e8a

and/or

https://github.com/TEIC/TEI/commit/a5892a7bbbf8212eb3f66137790c5708bb64dd7b

which are changes to the <desc> of <msFrag> seem to have broken Jenkins? 

https://jenkins.tei-c.org/job/TEIP5-dev/changes 

The errors from that build https://jenkins.tei-c.org/job/TEIP5-dev/242/parsed_console/ all seem to relate to the creation of EPUB and seem to cover every chapter of the Guidelines complaining about fragment identifiers.

I've spent a bit of time investigating it but haven't figured out why EPUB should be affected by this change (or what randomly changed in between this and the last successful build.)  :-(