I am a US Citizen, and I am considering getting an X gender marker on my passport.
On the US State Department website, it claims that I may face entry restrictions into some countries as a result:
While the United States Government issues passports with the X gender marker, it cannot guarantee your entry or transit through other countries. You may face entry restrictions in countries that do not recognize the X gender marker. Before you travel, check with the foreign embassy or consulate in the United States for more information.
The equivalent Canadian government page has similar langauge:
While the Government of Canada recognizes the “X” gender identifier, it cannot guarantee your entry or transit through other countries.
Are there specific countries which are known to have a policy of refusing entry to people with X gender markers who would otherwise be able to enter? Is there a list of such countries? I wasn't able to find one.
If there's no list, are there accounts of people being turned away for this reason? Or are these statements hypothetical, with no documented cases where such an event has occurred?
I am aware that some electronic systems or paperwork may not support an X gender marker, and that I may need to list either female or male instead. I am fine doing so, I'm just asking if there are countries where I would be turned away regardless of what option I select, based on having an X on my passport.