Issue references in PRs not being linked

We have issue references in PRs that used to show up linked and now don't. Formats that used to work (and are now not showing links:

feat: [CDS-31304]: Fixes for migration
fix: [PL-19562]: fix error when not able to connect to Git provider
[CI-3602]: unclear error - namespace not found

This is not limited to our project only, but it shows up in open source projects as well:
https://github.com/pentaho/pentaho-kettle/pulls
PDI-18996 resolution
[SP-6110][BAD-1920] Optional automatic updates of Hadoop*-site.xml

https://github.com/chocolatey/ChocolateyGUI/pulls
[WIP] (GH-376) Added new chocolatey packages

No source files, tests, or entry points are identified in the issue. Start by reproducing the listed pull-request examples and trace how issue references are detected and linked; done means the shown Jira-style references link correctly again across the reported projects. The repository is marked deprecated and says the work moved to a private repository.

Written by the indexing model from the issue text.