Recently, an automation was required to replace the default customer notification for when a public comment added. This was so that specific users were excluded. I built an automation that was triggered by a public comment being added which sent an email containing {{comment.body}}.
The resulting email for customers looked like this:

This week the link in automated emails is no longer rendering.
I have checked Compliance Settings; Attachment Security; Wiki Rendering etc. and cannot fix the issue.
Is there a quick fix, or was there a system change that impacted automations over the last few days?