You should be fine. With the 3.23 rear gear ratio your crew cab with the 5.3 will tow up to 9600. Its definitly better to leave 10% head room so call it 8800 lb. you can safely tow.
I picked up my 19 SIlverado LTZ, Z71, Crew Cab a few weeks ago. It was a dealer demo so that knocked off $1500. GM had rebates going on for this month so that knocked off $8k. My wife has a GM employee discount and that knocked off another almost $4k. All that coupled with the trade in on my 2011 I ended up paying 50% off the MSRP of $52k. I'm totally happy with that!
I have seen this once in my new 2019 that I have had for less than 2 weeks. Not making me feel great to see a bug like this already. However, the bright side is that it is most likely simply a software code upgrade that can be pushed down.