When trading with a trader NPC and the NPC will give a pokemon that evolves through trade, the evolution fails, the player's perspective detaches from the body, loses the ability to move and when any attempt is the hit, the game crashes.

I phrased the last part of the report very poorly, what I was intending to say was that while the perspective is detached, the player can press esc to rotate the camera around and any immediate attempt to hit anything crashes the world, sending the player to the menu. While in the detached mode, the player can deactivate the creative flight and swap the item held in the players hand, and the detached body can be moved around it seems.

Thank you for reporting this, I was able to confirm this however I was not able to move or fly at all and when I positioned my character to be able to hit something it did not crash.
Attached is a recording of my experience with this bug, I will mark it to be moved to our internal tracker.

Note for internal: Only happens in the overworld

Forwarded to Internal, thank you!

Forgot to add the video.
https://youtu.be/WYdIY428EjU

This issue was fixed in 9.0.6. If this continues to be an issue, please open a new ticket.