After a crash on April 18, 2020, about 20 days of Flight Records are missing.

On 19/4 I flew a number of flights and these records exist, but flights on 20/4 and 21/4 are missing, together with the missing flights from 21/3 to 18/4.

All other records and logs exist for this period, but the records that underlie Fligts Data,
DJIFligthRecord 2020-03-21xxx.txt toDJIFligthRecord 2020-04-18xxx.txt is missing.

Where could these missing records have disappeared?

If you want to recover these logs, maybe you can use a 3rd-party tool, I have used Bitwar Data Recovery to recover my deleted files, but I a, not sure whether it helps, you can have a try if necessary.
Hope it can help you.

By the way, here is the site: https://www.bitwar.net

Thanks Amimi, I have restarted my smart Controller from "ZERO", so when they are not in DJI's hidden database,
I have given up hope.

On the MavicPilot forum, I have made a detailed description of the entire course of events if you are interested
in seeing what can happen with Flight Data under certain circumstances.