Poor install or standard?

Just had roof redecked and shingled. Noticed some exposed nails on roof which made me question what was underneath. Went to attic and noticed some pretty big gaps between decking. Any advice on if this is normal would be appreciated. Thanks!

It is standard to put new plywood/osb over top of skip sheathing (which it seems you have) They did miss the rafter with that one nail. Really need more details about the job and more pics to give better advice. Your pic does not show any gaps in the new sheathing.

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