Yoast reporting multiple H1 tags that aren't there

[mircokl]

• [ x ] I've read and understood the contribution guidelines.
• [ x ] I've searched for any related issues and avoided creating a duplicate issue.

Please give us a description of what happened.

Yoast analysis results in a custom record says: "Single title: H1s should only be used as your main title. Find all H1s in your text that aren't your main title and change them to a lower heading level!"
But there is only one H1 tag on the page. I checked the whole page source code. It does not only appear in one specific record, but in at least most of the records.

Please describe what you expected to happen and why.

I would expect the analysis result not to say, that there is more than one H1 tag on the page.

How can we reproduce this behavior?

1. https://www.der-niedergelassene-arzt.de/beitragsdetails/depression-grosse-belastung-fuer-das-familienleben/1
2. https://www.der-niedergelassene-arzt.de/beitragsdetails/effektive-halbjaehrige-hiv-prophylaxe-mit-lenacapavir-in-studie-belegt/1
3. https://www.der-niedergelassene-arzt.de/beitragsdetails/handwerkerleistungen-vorauszahlen-und-steuern-sparen/1

Screenshots

Additional context

It may be relevant that I use rte_ckeditor for my records' bodytext.

Technical info

• TYPO3 version: 12.4.23
• Yoast SEO version: 9.0.3

Used third party extensions:

• news: 11.4.3
• eventnews: 6.0.2
• bootstrap_package: 13.0.5
• container: 2.3.6

[mircokl]

Update: Just updated yoast to version 10.0.0, but the issue still occurs.