AAF/OMFs exported from Premiere 2018 regularly place audio clips out of sync
Since the 2018 update, most of the AAFs and some OMFs I import into ProTools will have delayed audio clips. Usually the clips are in relative sync, but occur several seconds later in the sequence than they should. This is a bug that used to occur before the 2017 update and largely seemed to be fixed, only to return again in 2018. Whatever you changed in 2018, it broke AAF/OMF export again.
Gregory Palanque commented
Had a similar bug today. Audio was shifted by the amount of handle I had set (96frames / 4s).
It is worth noting that the audio in question was a nested sequence.
Running on Win10 Premiere 15.4.1