Word Import | BUG | Diacritic characters change language and formatting
if a Word docx or doc document contains text in italics that are not formatted using a character style diacritic characters will import to InDesign with:
 Wrong language property. Instead of e.g. English (US) it will be Arabic
 Formatting is in "Regular" and not in "Italic"
For more details see this thread at the Adobe InDesign Forum:
italics dropped for diacritic characters when importing Word docs
davescottpeattie, Jan 26, 2023
Also see my reply in the same thread for some sample screenshots and attached documents:
Also note that the Word Import allows the creation of several character styles with no names and no properties in the recieving document! At best this is a disturbing thing…
A workaround for that specific case was to copy/paste formatted from Word to InDesign.
( Adobe Community Expert )
David Peattie commented
This is a critical problem for us as we produce many scholarly books with italic diacritics and we have to search and fix for this manually!