HTC initialized a roll-out of Android Pie for a 2017 phone, the U11, in May 2019. However, not all users were served with this update before it was suspended due to technical issues. It seems the OEM has rectified them, as U11 owners in Europe have reported the successful installation of this update.
https://www.notebookcheck.net/Android-Pie-for-the-HTC-U11-finally-reaches-users-in-Europe.428644.0.html