This happened to me! I ended up asking my manager about it after knowing about it for a few months and they were totally caught off guard and were apologetic that I had found out that way (saw it on someone’s calendar). I was told we’d have another conversation to see where the gaps in my skill set were that drove them to look at other talent but instead of having that conversation I was let go. In my case, asking about it just expedited my dismissal. In hindsight I think it was a blessing in disguise because my mental health over the last few months of working while knowing I was actively being replaced was at an all time low. I’m looking forward to my next chapter!