Broken links are no longer display at strickken through

I’m running the broken link checker and have it set to display broken. links at stricken through on the website. Which works fine and serves as a warning to readers if I’m not up-to-date with maintenance.

But as soon as I activate the Jetpack plugin, the strike through is no longer displayed. And I can’t find a setting to make it re-appear.

How do it do this?

Thanks,
Jens

https://www.ads-software.com/plugins/jetpack/