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If $setOnInsert has dontApply == true, it should probably bail out early from _appendNewFromMods like the rename mods:

        case Mod::RENAME_FROM:
        case Mod::RENAME_TO:
            if (modState.dontApply) {
                return;
            }

Test

c = db.c;
c.drop();

c.save( { a:1 } );
c.update( {}, { $setOnInsert:{ 'b.c':1 }, $set:{ d:1 } } );
printjson( c.findOne() );

Output

{
	"_id" : ObjectId("5127d71b69c410f31b5f2ef1"),
	"a" : 1,
	"b" : {          // <-- There should not be a 'b' field here.
		
	},
	"d" : 1
}