It takes 3 months to manufacture a chip end to end. If you find a hardware bug once complete, you have to start over and you end up with a three month delay.

Looks like the Pro and Max will be on a three month delay.

If you find a hardware bug that late, you're not fixing it and you're looking for chicken bits to flip. It is /extremely/ expensive to validate changes and remake the masks.

It may not have even gone to manufacture to find out there was an issue. And yeah, remaking masks takes time.