I've just done the steps I commented, no errors found.
Jenkins 2.204.4 with Timestamper 1.11.1 and OWASP Markup Formatter 1.8:
A job with a table in its description:
The table and html escaped:
Updated to Jenkins 2.222.1:
Updated the plugin versions:
Description shown as expected:
And no errors on console.
Sorry Basile Chandesris maybe I missed some step or it's something related with your environment, most likely changed jar (owasp dependency) in an unexpected way, but it's weird someone did so. If you could give us some steps to reproduce the problem it would help to find out the issue. In other case I'm sorry we will close this ticket as cannot reproduce.
To be clear, I don't doubt there could be a potential issue here, it's just that without a way to reproduce it or any extra valuable information, we cannot do too much for now.