I was working on Blender for 2D animation and at some point the keyframes just disappeared. They are still there hidden because I can access my drawings but the yellow squares are not visible anymore:
Did I activate some shortcut by accident ? Or is it a bug regarding grease pencil ?
EDIT 1: The solutions given here Hidden keyframes in timeline do not solve my problem. Scrolling up as much as I can do not bring back the keyframes, nor clicking view -> Frame all.
Normally I should see the layers below "summary" but here they just disappeared but they are still visible in the layer panel.