I have the same problem, I'm also in contact with Parrot.
Here is what I found out so far, have copied it from the forum "editing problems"...
Up to now I have not got any helpful response from Parrot, the problem is still there and puzzles me. For what I'm doing it is real disadvantage.
I did some research to find out details of the recorded videos, the ones without a problem and the newer faulty ones.
I have compared my video clips and the times when they were taken.
The last video without the fault is from the 5th of May 2019.
The first video with the fault I recorded on the 8th of May 2019
i can't say for sure when I made the update of the Anafi firmware, but it was in these days.
Checking the beginning of the second segments of videos I found this:
With the old firmware
Keyframe
30 frames
Keyframe
30 frames...
With the current firmware 1.5.6
Keyframe
Keyframe
30 frames
Keyframe
30 frames...
Obviously the two consecutive Keyframes at the beginning confuse my Adobe Premiere.
When I manage to delete the first keyframe of the faulty segment I can import the file to Premiere, however there is a visible gap in the transition. This jump I noticed independently of what other editing softwares I used.
Hopefully in September, the vacation period is over in France, and a new firmware without this bug will come.
