My browser / operating system: Windows NT 10.0, Firefox 92.0, No Flash versions detected

When you post a usertag in a comment, followed by another usertag with the same characters as the previous usertag and more characters, only part of the usertag highlights.
Image:

Link to comment: https://scratch.mit.edu/users/Reev0102/#comments-160763959

Bring zis topic to ze front page

This happens so much in about mes and comments and it's been going on for so long now.

Can replicate on MyBearWorld's profile…

bump

Can replicate, Firefox 92 on macOS 11.6

Can replicate on all profiles, and all my devices including:
My browser / operating system: Windows NT 10.0, Firefox 92.0, No Flash version detected

Can repo everywhere
My browser / operating system: MacOS Macintosh X 10.15.6, Safari 14.1.2, No Flash version detected

yeah, i also have this bug here