Hi. In some update last year, keyframe easing handles broke in a weird way:
When you've got a keyframe at the very start of a clip, it clamps the easing handle distance to some time after it, for some reason.
Here's a video of what that looks like, and I also show what I have to do to make it work like I want it to again (moving the keframe to the right, adjust the handle, then move it back to the left again)