It’s a minor bug only and won’t affect a lot of people.
I bought a retail company with current stock of 200 cars and 30 more in transit.
The retail sales report didn’t show up at all for the purchased company until the in transit stock arrived. Now it show up but only for that 30 stock.
So the bug is - the Retail Sales Inventory report does not transfer info about current stock on hand to the new owner.