I am running WordPress 4.9.5, with the latest Polylang on Nginx. Language selection works fine for Posts, and the Frontpage. But normal Pages return a 404 error, unless I set the site to run with 'Plain' permalinks.
It feels like it's either a Nginx config issue, or more likely a bug in Polylang where it's not catching the language properly.
Does anyone have any ideas or possible insight to fixing this?