Since a month or so, Special:LintErrors on nl.wikibooks says there are 16 stripped tags, but Special:LintErrors/stripped-tag shows zero pages. Is there something I can do to fix that?
Topic on Help talk:Lint errors/stripped-tag
It's a known bug. The best thing to do is to ask User:Firefly on en.WP to set up a page like https://fireflytools.toolforge.org/linter/enwiki for nlwikibooks.