Export a WordPress post as Adobe TaggedText for import to InDesign
This is an infrequent, but known issue. Support for non-English characters and special characters has improved over past versions, but is still not 100%. If the plugin finds a character is does not recognize, it will be replaced with a box, making it easy to fix manually in InDesign. If you come across this, please email the TaggedText file and a link to the live post on your site to firstname.lastname@example.org
Please create an issue on the GitHub page. Creating a pull request with a fix is an even better option.