Charset issues on PHP 8.1+

[swissspidy]

Bug Description

It was reported to us a couple of times that there are character issues on PHP 8.1.

I noticed it has to do with DOMDocument not recognizing <meta charSet="utf-8"/> (with uppercase S, as output by React) properly and thus assuming an incorrect encoding.

Expected Behaviour

UTF-8 characters should be displayed as expected.

Steps to Reproduce

1. Use PHP 8.1
2. Create a story with content like

   హలో
   â, î ñ ô ü
   español
   गईं।
   English
   தமிழ்
   

3. Preview story

Screenshots

Incorrect:

Correct:

Additional Context

• Plugin Version: 1.27.0
• WordPress Version: 6.1
• Operating System: macOS
• Browser: Chrome
• PHP Version: 8.1