Current size of live show buffer is not displayed

Server Version#: 1.19.1.2645
Player Version#: 2.17 (15210)
Tuner Make/Model: HDHomeRun Dual
Guide/Lineup name: OTA
Using XMLTV?: No

When I start to watch a live show, the buffer of current show is not displayed on the timeline.
On macOS client (for example), I do see the current buffer on top the timeline which let me where it starts and where it stops. I know clients behave differently (and I’m doing my first steps with LiveTV feature). I don’t know whether it’s a bug or the expected behaviour on AppleTV client.

So, when I want to rewind or fast forward I have no clue where I can stop. I can go beyond the limit of the buffer and if I do, it sometimes hangs (black screen with the wheel spinning forever)
Once again, on macOS client, it’s not possible to go beyond.

Is it something known?

Thank you

As I noticed, the UI is the way it’s supposed to be in the tvOS app. The FF/RW bug still remains and is a known problem and discussed in this (huge) thread Start Watching Recording in Progress from Beginning(Failing)