I'm importing Norwegian text from Word (newest version) into InDesign 17.1 on a Win10 pc, using the regular script for most of the text, but som parts may be in Italics. If the text in Italics contains Nordic Characters (o-slash, a-ring and ae-lig), then InDesign will switch to regular script when importing it, at least for some words, or until a period, it varies.
"When it comes to pasting text from another document or application, InDesign provides two options, either keeping the original text attributes, fonts, styles (the full 'Paste' feature), or removing all attributes ('Paste without formatting'.) We also have tools and preferences in the field of style mapping, but on many occasions these features do not fit the need of dealing quickly with basic formatting problems. Here RichPaste comes to the rescue…"
I noticed this problem during proof-reading texts that are made from .rtf, .doc and .docx files. I've never seen this problem before, so I guess they thye started with the .docx format. Not a big problem for me, just an opportunity to address the old story: The special Nordic (and other nations) characters are still bugging a lot of programs.