Chinese characters do not render correctly

[ThexXTURBOXx]

Description
Chinese characters render as question marks.

Steps to Reproduce
Specific steps to reproduce the behavior:

1. Let RSTA render chinese text in some way (in my case, loading it from a file)
2. The characters render as unknown characters (similar to �)

Expected behavior
The chinese characters should be shown as usual

Actual behavior
The characters render as unknown characters (similar to �)

Screenshots
See issue at my repo: ThexXTURBOXx/Luyten#2

Java version
Tested myself on Java 8 and Java 17

Additional context

Chinese characters were working fine in 3.2.0, but they do not work in 3.3.0 (and newer).
I have searched within the changes between the two versions: 3.2.0...3.3.0
And I suspect that adding these lines is the culprit, however I am not entirely sure and have not tested this properly.

This issue was reported to me via ThexXTURBOXx/Luyten#2. If you need some chinese text to test this on your end, here you go: Test.txt

[bobbylight]

Are you using a custom Theme? How is the RSTA initialized as far as colors and fonts are concerned?

[ThexXTURBOXx]

Luyten only uses built-in Themes, loaded via their respective XML file, as seen here.
Actually applying the Theme and Font happens here.
It is worth mentioning that one can also set the Font during runtime, as seen here. However, I have not yet tested re-setting the font when Chinese text is currently being displayed.

[Mgazul]

After testing, the problem is related to Theme. You need to switch the idea theme once before Chinese can be displayed correctly.