My switch to Rekordbox6 was on the 17th April.
The library from RB5 was imported directly after (around 990 tracks)
Since then I have added to RB6 around 16 new tracks.
If I now playing a set, the history which is automatically saved at the USB stick is complete and all in the correct order.
If I now plug in my USB stick in my PC and open it in RB6, it still shows the correct history.
But when I import the library with songs, which were brought over from RB5, are not in the history anymore, just the song which were added after the move to RB6.
In addition it not counts the play counter of the old songs, just the new ones (who many times you have played them).
Problem solving done until now:
format USB stick
add the old songs again on the stick
re-import the RB5 library
The only problem which could solve this issue is to delete the whole main library and re-add the old song (I tried it with 1 song).
But that means I need to add all cue points, loops, track analyze again and I lose the date, when I have added them (this is a main category for my organization) for more than 1000 songs.
I have made a video to show the issue.https://youtu.be/UsEHOM45D6k