Headlines in post body do not get rendered reliably

For quite some time I do have the issue that headlines do not get rendered reliably. Most of the time it works as it should, but sometimes it does not. This does also affect older posts and articles where it used to work fine. It started out of the blue and does not affect all pages/threads/articles but only some - however, I was not able to discover a pattern until now. Looks like that then:


With this two year old article for example rendering used to work fine, even after...

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