Doubly-escaped HTML special characters in Plain Text blocks, also in old posts

[mschmitt]

Steps to Reproduce

1. Create a Syntaxhighligher block containing the following:

<foo>
bar &

2. Choose type "Plain Text".
3. Preview or publish

What I Expected

Content displayed as:

<foo>
bar &

What Happened Instead

Content displayed as:

<foo>
bar &

PHP / WordPress / SyntaxHighlighter Evolved version

• Debian 12
• PHP 8.2
• WordPress 6.7.2 running Twenty Fourteen theme
• SyntaxHighlighter Evolved 3.7.2

Browser / OS version

• Any browser on any OS

Screenshot / Video

A degraded public post from 2024: https://binblog.de/2024/03/04/failsafe-curl/ (No longer visible. Blog rolled back to 3.7.1.)

Reproducer from above:

Context / Source

Noticed just recently. Display degraded on all existing posts. Rolled back to version 3.7.1.