Ovens lie. Yours might run cold. Maybe you opened the door twenty times to peek at it (guilty). Each peek costs 10 degrees of heat and about 5 extra minutes of cook time.
If the breast hits 165°F but the stuffing is still 150°F, don’t panic. Scoop the stuffing into a baking dish and pop it in the oven for 15 more minutes. Problem solved.
Worst case? The turkey is done, but the stuffing is behind. Serve the turkey now. Heat the stuffing separately. Nobody will know. Promise.