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Would more suspicious the timing is well off. A hard shift can cause to have a load on the crank and when the timing belt tensioner is broken/loose or just bad you can skip couple of notches. Normally manual gearboxes have a protective guide over the crank-axle sprocket to prevent tooth jumping. Just in case this piece is or went missing it could have happened. Check the metal plate in this (see this unsharp image just above the sprocket) from this thread.

Low compression reading? And same reading on all four cylinders? I would suspect a problem with the compression gage itself.