In the code snippet below there will be an blank line rendered at the end of the section, I suppose in almost every case it is a mistake.
== h1 == ffff == h2 == ggg
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How is that incorrect or problematic markup?
The rendered blank line looks bad visually.
Feel free to close this if it is out of scope for this project.
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This seems like something that should be addressed via WPCleaner or bot runs. It is not invalid markup, so it should not be tagged as part of the Linter project.