When two task Ids are put into a task separated by only a slash, the email uses links to the objects, but doesnt add whitespace so that they are distinct links in the email.
E.g. here is one email body I just received
I think implementing https://phabricator.wikimedia.org/T120165/https://phabricator.wikimedia.org/T136080 might bring this forward a long way (IIUIC). ....