HLS.Live: why playback gap (vs realtime) is always larger than playlist length?

options:
minBufferLength = 3
maxBufferLength = 5

Playlist:
TD = 2 sec
4 file ~ 8 sec (> 3xTD)
Playlist length: ~8 sec.

Buffer length 8-10 sec (> 4xTD), regardless options above.

As a result, the playback gap from real time is significant 9-12 seconds,
but HLS standard (without options) recommend for 3xTD (6 sec.) for players,
and with options above should be 5 seconds.

Why?

P.S.
hls.js { liveSyncDurationCount: 2, liveMaxLatencyDurationCount: 4 }
at the same stream gives delay 4-5 sec stable.
If you wish, I can provide the stream for debugging.

Reproduce playback with minBufferLength=3 and maxBufferLength=5 against the reported playlist and compare the observed live gap with the configured limits. Trace the live buffer and latency calculation; done means the playback gap follows the options and the expected HLS target-duration behavior.

Written by the indexing model from the issue text.