Wa alaikum assalaam wa rahmatullahi wa barakatuh.
Jazakum Allahu khairan for your dua’.
In the recitation of Hafs ‘an ‘Aasim, there are no changes to when stopping on a word with a . The recitation of though changes when stopping on a word which has a in the middle or on the end of a word, and the riwaayah of Hishaam changes the if it is on the end of the word (last letter), when stopping on that word.
If you heard the recitation as if had been changed into a ya’ saakinah and therefore having a two count natural lengthening , then it is either the recitation of or the riwaayah of Hishaam. Stopping on this word would normally be done as requested from a teacher (when reciting the different qira’aat) or if the reciter ran out of breath, but not in the normal course or reading this aayah.
On the whole, you will not find recordings of recitation stopping with , but if you listen to the different qira’aat, specifically the recitation of Hamzah ( ), you will more likely encounter it, but not necessarily.
Wa assalaam alaikum wa rahmatullah