I don't know what to do. There was only one other person with this problem and the solution was.. there is none and you should render in the viewport. In the viewport it looks exactly as expected but
My Grease Pencil drawings disappear after frame 132 : r/blenderhelp
Animation Magazine Comic Con 22 Edition by Animation Magazine, Inc. - Issuu
eyes, puckered
How to Sketch Animations in Blender, by Nancy Yi Liang, Hackers && Makers
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How to convert a line drawn with a grease pencil into a 3D model.