Within job, there is a build list. On this list, there used to be links to PRs. Currently I can see HTML tags instead of links:
#13872 3 MB Apr 9, 2020 2:22 PM <a href="https://XXX" >PR #8260 XXX-26550] Xxxxxx </a>
This is caused by the upgraded markup formatter https://github.com/jenkinsci/antisamy-markup-formatter-plugin/releases/tag/antisamy-markup-formatter-2.0
I have downgraded "OWASP Markup Formatter" to 1.8 and see no improvement. Maybe there is something else causing this?
This works for me with plugin version 1.17 and formatter 1.8 on Jenkins ver. 2.204.5 Without a way to reproduce there isn't much I can do to help. Maybe you are actually using a different markup formatter?