Animation: Timeline f-curve interpolation blows up when copy/pasting keyframes

mmdestiny

I can't figure out if this is a bug, some sort of calcualation error, or what.

Any time I copy/paste a series of more than 2 key frames in a row, the TCB interpolation blows up, as you can see in the image below.  (In the image, the three initial keys were copy pasted in reverse sequence, but the same issue regardless of sequence.)

The issue is manageable, because if I select the affected keys, set them to Linear, then back to TCB, the curves return to normal, but this is still something that I would think shouldn't occur in the first place.

If this is indeed a bug and not the result of something I haven't thought of, please let me know and I'll open a ticket with tech support.