I have this issue too. After updating OS to the 22H2 Sinhala language is not showing correctly,
This is not correct! (This is the screenshot taken after updated to windows 11 22H2)
This should be like this,
This is correct! (This screenshot is taken on another pc which is not updated to windows 11 22H2 and still running windows 11 21H2)
Please fix this issue soon! This is a really big issue for my university works too!
Microsoft office also not correctly rendering the Sinhala language. Please fix this soon!