Versions affected:
InDesign CC2021 (and older).

Steps:
1. Use a non-english Word-version to make a Word-document.
2. Use built-in styles to style text. For example "Overskrift 1" ("Heading 1" in Norwegian).
3. Save as .docx
4. Save as .doc
4. In InDesign, Place the two Word-documents (including styles/formatting)

Expected result:
* Both documents import with the same style names they had in Word ("Overskrift 1").

Result:
* The docx places the text with the style name "Heading 1" (wrong)
* The doc places the text with the style name "Overskrift 1" (correct)

This makes round-trips via Word problematic. We are forced to tell all designers to manually convert Word-documents to the old .doc-format before placing as a workaround.