I have the false neutral problem too, anything less than a firm stab on the gear lever can put it between gears, I tried to cause it today and found a light down shift 6th to 5th would almost guarantee it.
Not a huge issue, I just need to get used to it again, too many years ago I raced Montessa's, Bultaco's and early KTM's, they all seemed to come with a spare bag of neutrals, you do get used to it, not ideal but ok.
Not sure what the dealer can do about it but I will be challenging them to fix it. Won't be holding my breath though.