[Ubuntu 21.10] UTF-8 symbols not displayed properly in IDE

[Batwam]

I am using code which includes UTF-8 symbols (for export to a web page). These symbols are displayed fine on the Windows version of the IDE but when I open the file in Ubuntu, most of them are not being displayed (there is no specific error generated in the terminal).

For examples UTF-8 symbols like these are not showing: 🌞 🌑 🌔 🌜🌙
As I long as I don't touch the file, the characters are still exported with the code compilation as they still appear on the web page but the IDE is not displaying them.

Is this a known issue with the IDE? I am the IDE using 1.8.15

Content of my update-locale

LANG="en_AU.UTF-8"
LANGUAGE="en_AU:en"

Screenshots

Windows version:

Ubuntu 21.10 version:

[per1234]

Thanks for your report @Batwam. I am able to reproduce the bug with Arduino IDE 1.8.19, but not with Arduino IDE 2.0.0, so I will close this as resolved.

[Batwam]

confirmed, I just tried the 2.0.0 version in Flatpaj and this issue is fixed.