iOS video player behavior on 404/410/5xx

Hello,

In one of the response (https://forums.developer.apple.com/message/19204) I noticed that apple support person mentioned as below

"A 404/410/5xx from a media segment may cause us to skip the segment and move on to the next.

Unless the stream is unmuxed, which case we will stop playback immediately."

I have a case when the request for the .vtt files returned 404, video player was frozen. I don't have any logs on that but I was wondering what could have caused it if the player is expected to skip that segment and continue.