It certenly could be the cause of the misfire as when you reintroduce exaust into the intake you lean out the mixture and could cause a lean misfire , although usually it would lean out all cylinders ,the source of the leak is at the egr valve that effects all cylinders , it all depends on the design of the engine ,the intake manifold on some honda engines has different size holes were the egr gases go into the intake so if one passage is the largest more egr will get dumped into that cylinder causing a misfire , others ports are partly blocked . You would need both problems to be there partly plugged 134 cylinder intake manifold egr passages ans your leaking egr valve gasket blown out as in your picture , . In your case cylinder #2 as your misfire code is po302.
im not familiar with that engine as its not available here in Canada . One of the most common problems in Canada on the 1.5 liter engine for misfire is loose spark plugs , that damages the coil pack from hot exaust blowing on it from the loose plugs , and too tight valve clearances usualy causes misfire on cold engines .
Don