Yes, I just found it, I bolded the relevant part in case it helps anyone.
https://sellercentral.amazon.com/forums/t/fba-shipment-policy-updates/953588
Effective April 1, 2022, if you send canceled or deleted shipments to Amazon, your shipments may be rejected. Your ability to send us additional shipments may also be suspended.
The following actions lead to additional processing, handling, and rerouting, which can delay the receipt of your inventory and its availability for sale:
Deleting shipping plans after you've approved them
Misrouting shipments
Sending incomplete shipments, such as shipments that are in canceled or deleted status
To avoid problems that can cause delays, follow these guidelines:
When creating a shipping plan, specify the quantity, content, and other information that might affect the distribution of the shipments.
After approving the shipping plan, be sure to send the shipment to the assigned fulfillment center with the quantity and content specified in the plan.
[Moderator edit: SEAmod updated this bullet point at the request of the business team.} After approving a multi-destination shipping plan, do not delete any part of the shipment or send the shipment along a different route. Make sure that all of the shipments in the multi-destination plan arrive at our fulfillment center within 30 days of our receipt of the first shipment.
Make sure your FBA box ID label is clearly visible.
[Moderator edit: SEAmod updated this bullet point at the request of the business team.} Work with your carrier to ensure that your shipment is delivered to the address on the FBA box ID label on