The problem is that the animation refuses to end at the last keyframe and I have found no way of setting the animation’s length manually. I went through the object hierarchy and found no keyframes beyond 3 seconds so Im I bit lost on how to crop out the unwanted last part.
I got a very same problem like you and found a soultion, maybe you can try this:
Go to the end of your clip(the last keyframe), and right click on your timeline,choose"Add keyframe", then the clip will be cut off at the right posion, all useless tail will be gone.
It seems there is no way to set the length of clip dircectly
