T between two vowels in Gen American English (in stressed? or unstressed syllable?) is commonly pronounced as alveolar flap /ɾ/. Example words include better, water, butter, matter etc.
The /r/ in Gen American English is usually /ɹ/ as far as I know. So in words like word, bird, earth etc, it is /ɹ/.
I recently heard some words that end in rt+vowel whose pronunciation bewildered me. Words like party transcription in the dictionary: /ˈpɑːr.t̬i/, the dictionary has given /t̬/ and /r/ in the transcription but when I listen to the pronunciation, it is only /t̬/ (aka flap: /ɾ/). And sometimes it sounds as if it has no flap at all and has only /ɹ/.
Another example is flirty, whose transcription is: /ˈflɝː.t̬i/ but there is no /ɹ/ at all in the pronunciation (although these are dictionary pronunciation, they may not clearly demonstrate the how native speakers pronounce them).
It mostly happens (as I have noticed) when a words ends in /r/+/t/+vowel.
So what's really happening here? Is the /ɹ/ usually dropped? Or is it the flap that is dropped?