I have done everything accordingly, but the problem remains. First everything appears correctly, after a few calls the characters are corrupt again.
If I paste an article from my site as a permalink on another website, it should look like this: https://existenzielle-fuehrung.de/wp-content/uploads/2021/04/normaloutput.png.
If I have activated your plugin, then the characters are no longer displayed correctly: https://existenzielle-fuehrung.de/wp-content/uploads/2021/04/badoutput.png .
It seems that the charset is no longer interpreted correctly.
