Parsoid's bug 49844 with link attributes has been fixed.
In https://bugzilla.wikimedia.org/show_bug.cgi?id=49844#c5 James Forrester wrote:
This is worked around (albeit with potentially a bit of a hack) in VisualEditor, so not so important now from VisualEditor's POV.
Now that the parsoid fix has been deployed (for a while now), I'm opening a new bug to revert Visual Editor's hack.
Version: unspecified
Severity: normal