Italic unicode character support on Windows

My plugin displays code completion suggestions as inlays rendered in the user's font (usually JetBrains Mono) and italicized. Several of my users on Windows report that non-ascii characters do not render properly in the suggestions:

When the suggestion is accepted, then the text renders correctly:

Note that this works perfectly fine on other operating systems. Only Windows has this issue.

One workaround is for users to set a fallback font in their settings. This resolves the issue but is not ideal. Is there a way to render italic Unicode characters in JetBrains Mono?