"bsoncore.Value#String()" is meant be extended JSON but stringifies the timestamp uint32 values for I and U which is antethesis of the expected behavior. This effects both bson.Raw#String() and bson.RawValue#String(). Decoding the stringified value of either will result in the following error:

var doc bson.Raw
if err := bson.UnmarshalExtJSON([]byte(cmdCopy.String()), true, &doc); err != nil {
        // panic: error: $timestamp t value should be uint32, but instead is string
	panic(fmt.Sprintf("error: %v", err)) 
}