When I record a video (vertically/portrait) it shows the preview photo allright but when playing, the aspect ratio is distorted, like the height is only about 50% of what it should be.
When sending the video to someone else it displays perfectly on an iPhone, so the issue is not the recording, it’s the playback.
I have the problem with both the standard Google photos app and the ‘Gallery’ app I downloaded.
The height of the video is about half what is should be, while the width seems correct. It also behaves very odd when you rotate the device, like its always 90° ahead of you.