Hey Andre,
Are you able to play the clip in any of media viewers on your Mac, like VLC?
If not, the problem could be that the files either didn’t “close” properly, or are missing some kind of MXF auxiliary file, or that a different codec was used on the EVS to that of the previous batch?
Have you got either FCPX, Compressor or Resolve, just to see if they’ll take it?
Although FCPX is notorious for rejecting anything and everything, in comparison to PPro.
Alternatively, do consider rolling back PPro one or two versions, and see if that works. Adobe in the past have had a habit where they removed codecs/”containers” for one reason or another.
MKV format was the biggest surprise, which has still not been explained.
Although that is in the other end of the scala in comparison to what one would expect from EVS files.
If you have done it before, there is no reason for why you should not be able to do it again.