I can reproduce this too (sometimes the username is bolded, but sometimes it isn't, looks like the page link is always bold tho)

Re-checked the notifications types that were described in the task, i.e.

• a page was reviewed
• a page was linked

There were some updates on wording in notifications (and overall design)

• a page was reviewed - the title of the reviewed page is bold; the link to a user name is on a separate line - clicking anywhere on the notifications redirects to to the reviewed page
• a page was linked - both pages titles are bold, clicking on the notification redirects to the page from where the link was made (from the screenshot it is Mavetuna703).
  

In T68385#5883884, @TerraCodes wrote:

I can reproduce this too (sometimes the username is bolded, but sometimes it isn't, looks like the page link is always bold tho)

The inconsistency is, indeed is here:

• the notification of successful mention - "Your mention of [user] was sent" - the username is bolded, but the redirect will be to the page where the mention was made

The following case of bolding seems to be fine:

• the mention notification will bold a talk page title and a section title where the mention occurs