Frame Hold Glitch
So this has only been an intermittent problem, and it's unclear if there is a trigger that would make it predictable. I am using a frame hold to pause a video and bring in a second PIP video that plays while the primary video is paused. The Frame-Held clip keyframes a zoom out to 90% and a zoom in to full. I used to do this process by taking a screenshot of the frame, importing the screenshot and applying the effects to that. Using the Frame Hold function just maintains a cleaner capture scratch and is easier to adjust if I decide to choose a different frame to pause the video. The problem is that twice now (first time was months ago when I was working on the proof for this project) the frame held footage "ends" before the clip ends. The image is still visible at the point in the timecode, and it exports as though nothing were wrong. But in the Effect Controls tab, the footage does not fill the timeline and I cannot apply the necessary keyframes to zoom in and out.
Last time this happened I spent a good while searching and trying to find if anyone else had encountered this and find a solution--without success, and in the end just resorted to using my old method with the screenshot and moving on.
Has anyone else encountered this unpredictable glitch? Were you able to correct it (not just work around it)?
Here is a screenshot of the problem. My cursor is on a frame after the footage "ends" so you can see that Premiere is still reading the clip.