So yeah as the title states I have seen this since the back end of last year.
Latest version is Engine DJ v3.0.0
Open Engine DJ & it loads tracks ok which have mp3 tags with date created & modified etc.
Pop some into Collection - all good
Go to Collection pop some onto USB stick - all good
Go back to ‘Files’ & all the track’s ‘Date created’ reset to 01/01/1970 !
It looks like the tags aren’t being read when load tracks.
Only way to get the correct dates back is to close Engine & restart.