No, I was just wondering because I can not reproduce this although I’ve got the same OS and KNIME versions.
I think this issue does not result from your encoding settings, but rather from a problem in your font mapping. There are quite a few issues with chinese characters in BIRT (especially when they are embedded in images). This link might help you to fix your font mappings: https://www.eclipse.org/forums/index.php/t/209058/
After a quick view of the link and research the problem, I suppose the solution maybe in ‘fontsConfig.xml’ or the font in C:\Program Files\Java\jre1.8.0_161\lib\fonts\.
But I can not make it works. Well, I’ll leave the problem here and use Chart component in BIRT instead of use image directly for now.