iOS: Version 3.1.0 subtitle position fixed to video when filling the screen on iPhone

This happend in version 3.1.0. The subtitles have a fixed position on the video. This means that the subtitles are cut along with the lower part of the video when I fill it (double tap) to my iPhone X screen.

This did not happen in 3.0.3 and I’ve tested the same video files that I had before. The subtitles used to be on the same position/size as if the video was not zoomed in when filling the screen in 3.0.3.