How to keep advance buffering while seeking.

Hi,
can you ask you question about the advance buffering?
When I start playing the movie and advance buffering work and add new loaded .ts ahead, then make seek to area within these advance buffer times, the OSMF drop the advance buffer and start load the same .ts files that already loaded.

in another language if the player start work and its in 00:05 and the advance buffer in 00:16 and I click to position 00:09 then the player do seek and drop the rest of advance buffer and start download it again.
I use the bufferlength to present the advance buffering there are another way to do this?
So how can I prevent the OSMF to do such thing?

Thank you for your help.

Start with the OSMF seeking and advance-buffering behavior described in the issue, using bufferlength to observe the loaded range. Reproduce playback at 00:05, buffer through 00:16, then seek to 00:09 and check whether the existing .ts segments are discarded and downloaded again. Done means the expected buffering behavior and a supported way to prevent redundant downloads are documented or identified.

Written by the indexing model from the issue text.