Have you ever found a solution to this? I am on 2018.10
In my case, a night guy brought re-transcoded footage in via Source Browser as a Link and it changed even the original source clips (that were already synced) to Link with the link icon… but after removing the AAF files that were created and running relink on the files they do seem to act as usual source clips. However, the icon is still there, a couple of clips reverted their icon thought. And avid still randomly think they are AMA.
I just hope it won’t cause any issue when exporting EDLs and AAFs for Online editor.