I used the 3d rotation ("translation") tool to rotate a motion tween : putting a moving grid flat on the floor.
The effect shows fine in the scene testing, but not in the rendered .mov file.
Here, the motion tween is showing out of place and not rotated.
I was unable to find anything on this problem in the manual or chats, and would greatly appreciate any help you can give.
Convert all frames in your tween to Keyframes and see if this is enough and renders to MOV.
If not, export the whole animation to a PNG sequence which will render exactly what you see in Animate.
Combine the PNGs into a video using Premiere.
Hope this helps!