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WordPress 6.6 injects this css
:root :where(a:where(:not(.wp-element-button))) {
text-decoration: underline;
}
which causes all links, unless styled otherwise, to be underlined. They have said this will be fixed in 6.6.1, so if you have not yet updated and updating would cause your theme to be affected by this, consider waiting or having some override css at the ready to patch this.
Read more here:
https://wordpress.org/support/topic/6-6-update-caused-underline-on-all-links/
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We’re downgrading our client sites to WP 6.5.5 to solve the WordPress 6.6.0 underline bug. The 6.6.1 patch may not be released for a while, though it sounds like they are updating the Gutenberg plugin to fix it: [https://wordpress.org/support/topic/all-hyperlinks-now-underlined/](https://wordpress.org/support/topic/all-hyperlinks-now-underlined/)
This is a pretty big bug, I don’t see how it was not caught.