It's not a bug. The IRS changed the list of principal business codes for 2022 tax returns. Codes 454110 and 999999 have been eliminated. TurboTax is using the IRS list for 2022.
The updated IRS chart says that an online seller should use the code for retailers of the primary type of product that you sell. It would be the same code that you would use if you had a bricks-and-mortar store selling the same products. In other words, you use a code representing the type of products being sold, rather than the sales channel. For example, if you primarily sell electronics you would use 449210 Electronics & appliance retailers (including computers). If you primarily sell clothing you would use 458110 Clothing & clothing accessories retailers.
Code 999999 has been replaced by 999000.
