Comments unreadable in Java 8

[zjcz]

Description
RSyntaxTextArea formats the comments incorrectly in a Java 8 application. They appear fine in a Java 21 application. I have tested with the SyntaxEditingStyle SYNTAX_STYLE_JAVA, SYNTAX_STYLE_CSHARP and SYNTAX_STYLE_XML

Steps to Reproduce
Specific steps to reproduce the behavior:

1. Create a new project
2. Add the RSyntaxTextArea dependency
3. Add a new file TextEditorDemo.java file, add the code from the Example Usage in the GitHub project readme.md
4. Run the project
5. In the text area, type a comment. For example "// This is a Comment" or "/* This is a Comment */"

Expected behavior
I would expect to see the comments as typed, highlighted in green

Actual behavior
The comment text is replaced with illegible characters. The text is correct in the background, and can be copied and pasted into another app fine

Screenshots
Add a screenshot if it helps explain the problem.
This is screenshot from Java 8. The text entered is "//hello, this is a comment in Java 8"

This is screenshot from Java 21.

Java version
What version of Java are you running?
Error exists in Java 8. Error does not exist in Java 21 and comments are shown fine

Additional context
Discovered when using version 3.6.1 but still occurs in 3.6.2

[zjcz]

Despite spending hours searching for similar issues I couldn't find any before raising this. However, 5 minutes after raising I have now found #609 and #562 . I'm happy for this to be closed as it's a duplicate of those, or I can provide more information if it helps.