There's a bug that's specially noticeable when using easing that makes the last keyframe slightly jolt in position. Happens when you move the 'end' keyframe repeatedly after applying a tween.
Report the bug from this link.
I suspect it's the same old bug that makes the Transformation Point drift away from the Registration Point after a while when moving a symbol. The built-in camera is nothing more than a modified Movie Clip under the hood; it must have a Transformation Point as well but apparently the devs didn't account for drifting.
In a regular symbol you can fix this by double clicking the Transformation Point and reset its position back to the Registration Point, however this is inaccessible on the camera.
The only workaround I've found is to add a keyframe on the second to last frame of a tween span and move it at the end to fix the last frame jolt. You can find a quick video demonstration of this below.