Preview Text display on Font Editor does not apply SubFontFamily setting

The Preview text display in the Font Editor does not apply the Sub-Font family settings. Only the Default Font Family and Fallback Font Family can be applied to the display.

1. Open the attached project
2. Open "FT_MyFont" font asset
3. Input text "Hello こんにちは 안녕하세요 Привет مرحبًا" to Preview text area

Result:

Japanese text is not displayed.

Expected:

Japanese text is displayed with the font / scaling factor set in the Sub-Font Family applied.

"Session Disconnected" UEFN

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