I think we used to have the styles for the automatic section headings in edit summaries loaded for the global watchlist, but we don't currently - maybe for the same reason as T287649: Regression wmf.16: New vector no longer aligns sites correctly ?

Also for hidden user names with the class history-deleted

We can load the entire mediawiki.interface.helpers.styles module as a dependency, but that seems like overkill - all we need is

/* The auto-generated edit comments */
.autocomment,
.autocomment a,
.autocomment a:visited {
	color: #72777d;
}

/** rev_deleted stuff */
span.history-deleted {
	text-decoration: line-through;
	color: #72777d;
	font-style: italic;
}

From https://gerrit.wikimedia.org/g/mediawiki/core/+/63da9a14300c212c678b147f5703ffa356a452c7/resources/src/mediawiki.interface.helpers.styles.less