TODOs about epics do not link to at-mentioned users

Summary

Consider this TODO:

Screenshot_from_2019-01-09_13-27-48

It was generated by @jramsay mentioning me in a comment, here: &521 (comment 129965444)

The username @jlenny came at the start of the comment, and I would normally expect it to be a hyperlink to https://gitlab.com/jlenny , as it would be for an issue.

Steps to reproduce

Get someone to at-mention you in a comment on an issue. Observe the created TODO.

Example Project

&521 (comment 129965444)

What is the current bug behavior?

Users (and possibly other GFM entities?) in comments to epics are not correctly linked in TODOs (and possibly elsewhere?)

What is the expected correct behavior?

These should be correctly linked

Output of checks

This bug happens on GitLab.com

Possible fixes

Presumably this comes about because the banzai rendering context for this text lacks a project?

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