I am unable to upload the screenshot and the save files for some reason. "Something went wrong. Please try again." You can find the files here:
https://github.com/wilki24/HumankindBugReport

Description:
- Aircraft carrier on an ocean tile with 6 jets on board.

- An aerodrome on land with 2 jets. 

- Moved the 2 jets to the aircraft carrier.

- Move the aircraft carrier.

Expected:
- Aircraft combine together to make a squadron of 8.

Actual:
- The squadron of 6 jets is left behind on the tile the aircraft carrier was located when the attempt was made to merge the other 2 jets into the squadron.

Notes:
- The 6 jets are not visible, but are selectable on their ocean tile, and able to perform an airstrike. The animation starts and ends on the ocean tile.

- The aircraft carrier and squadron of 2 jets appears to behave as expected.

- In the attached screenshot, I have the 6 jet squad selected in the upper left . The aircraft carrier is the one near land on the bottom.
- A save/reload did not fix the issue.

diag_files.zip

On the next turn, I was no longer able to select the squadron stuck on the ocean tile, by clicking on the ocean tile. However, I could select it via the All Military Forces drop down.

I was then able to combine it successfully with the two jets on the aircraft carrier.

I now suspect this may have to do with the Pentagon's +1 to the number of bombardments bonus. I believe one or more of the 6 jets had bombarded once, but still had another bombardment available, when I tried to move the 2 jet squad onto the aircraft carrier.

I think the Pentagon may be the key to reproducing this.