My understanding of how the talent discussion is this.

Talent discussion is attended by HR, Talent Lead and People Lead.

Your People Lead to represent you and tell your performance story. Other people lead and Talent Lead to raise qns on the credibility of the story. Then decides which tier to put under first.

HR to ensure the discussion goes smoothly and provides inputs on stuff they know.

Once the first iteration is done, they will start again to trim down the list until they finalize it.

Lastly, the TL will then review the list and do whatever required (trim it down again due to budget/slots given) again and if nothing is wrong with it, send it off to the HR. Then the HR will determine your talent outcome based on the details provided by the TL.

So as you can see from the flow... your PL will only know what result you get based on the talent discussion. Which is only half of the whole process. Your TL will only know based on what they sent out... Ultimately, it's the HR that will determine your talent outcome based on budget and opportunity...

So don't feel shocked if your PL said you're in the promotion list but you're not promoted... it's because even your PL doesn't have the latest list...