FCPX 10.6.8 SHOWING BLACK FRAMES , CANT EXPORT- BUT SAME NOT HAPPENING IN PP

Hello,

I am facing this black frames issue with FCPX from 10.6.6 to 6.7 & now 10.6.8 where footage shows black frames when viewed in FCPX, same drop frames are not visible in Premier Pro.

can anyone help what can be concern.

I have done test on Canon R5 + Nikon Z8 on Prograde Cobalt series top of the line card + Angelbird Cf express Tybe B cards and seems to face same issue no matter which camera/card I choose.

You can see the attached excel where I have mentioend where in video I get black frames.

I checked card & camera company both and , definately not a issue with them as no matter whch camera/card I choose, these issued comes.

drive.google.com/drive/folders/1sVKGIz-b...UHE0OMoA?usp=sharing ( shot on Prograde Cobalt cards)

Shot on Angelbird CF ecpress cards

drive.google.com/drive/folders/1YuF7RNq5...sOoXqVLS?usp=sharing

Camera used - CANON R5 OR NIKON Z8 (both with latest firmware)

CARDS USED - ANGELBIRD 512GB SE CARDS & PROGRADE COBALT 325 GB

EXTERNAL DATA RECORDED ON - ANGELBIRD ATOMX 1 TB SSD ( USED WHEN RECORDING ON NINJA V+)

( NO MATTER WHICH CARDS I USE, ERROR COMES V90 OR CF EXPRESS TYPE 

HOW DATA IS COPIED ON SSD

- ANGELBIRD CF EXPRESS TYPEB MARK II CARD READER

- PROGRADE CF EXPRESS TYPEB CARD READER

- PROGRADE SD DUAL CARD READERS

DATA COPIED ON

- SAMSUNG 4TB RUGGED SSD

- SAMSUNG 2TB SSD RW(2000Mbps)

All footage once copied on SSD are directly imported into FCPX, As I use two machines to edit

Apple M1 Max 32 GB and Apple M1 Max 64 GB

and on both I am facing the issue.

As both LAPTOPS are fast so never used proxy to edit footage.