HLS live streaming does not work if it is EVENT type on Safari later than iOS 16

I'm working on live streaming encoder but I cannot start to play live stream correctly if the stream type (#EXT-X-PLAYLIST-TYPE) is EVENT.

When I try to play it, the stream starts from the beginning not the current position.

When I tested on iPhone 7 (iOS 15.7.8), live streams start correctly but I tested on iPhone 8 Plus (iOS 16.6), live streams start from the beginning. (I tested on other iPhones with iOS 16 or later and the result is the same.)

I also tried to add "#EXT-X-START:TIME-OFFSET" tag but it didn't work.

Is this behavior a bug or do I have to add some tag to play?