Lots of filters added to clip B eliminate the phantom frames:
Code:
A=Colorbars.KillAudio.Trim(0,-10).ShowFrameNumber # 10 frames
#[[
#B=A.Trim(0, -1) ## broken
#B=A.Trim(0, -1).Info ## fixed
#B=A.Trim(0, -1).Invert.Invert ## fixed
#B=A.Trim(0, -1).TurnLeft.TurnRight ## fixed
#B=A.Trim(0, -1).AssumeFrameBased ## broken
#B=A.Trim(0, -1).AssumeFPS(A) ## broken
B=A.Trim(0, -1).ChangeFPS(A) ## fixed
#]]
StackHorizontal(A,B)