transcode file format changed from ts to mp4

[blue212121]

hello, i just updated jellyfin from version 10.8.11 to 10.9.11 and this fixed an issue for me where when i wanted to play hevc encoded video from jellyfin-web from my phone (pixel 7a), it displayed the "this client isnt compatible with the media...." error message... now the update did fix this issue, but somewhere along the lines the transcoded video file extension and format changed from .ts to .mp4

i tried to look at the release history but could not pinpoint when this change occured between the two versions, and also dont know if there is any way to change it back?