I found out that when playing content on MAC Safari player start playing correctly HLS stream with .ts chunks.
But when using source selector to switch to other bitrate - it doesn’t play any more HLS but HTTP Progressive Download.
Additionally there is no auto bitrate switching working on MAC Safari.
Other interesting thing is when you have option to switch on resize - it works as it should while changing the size of the player (still wrong when using sourceSelector) and stays on HLS.
Was tested on 2.36 and 2.42 version of the player - the same behaviour.