Missing frames "hold previous" won't work

Missing frames "hold previous" won't work.
I'm enabling "hold previous" in order to have the last frame stick because the footage is shorter than the rest of the comp, but the frame goes blank anyway and won't hold.
What am I missing?
Thank you for helping.
I'm enabling "hold previous" in order to have the last frame stick because the footage is shorter than the rest of the comp, but the frame goes blank anyway and won't hold.
What am I missing?
Thank you for helping.