Response from Support on this (it’s due to new logic of the “Require Ready to Fulfill” which now also pertains to job material and transfer order details):
Site Config>AMM>Auto Fulfillment
If the flag is set True the a new tab will open on job material where you can manually send the material to the queue to be auto allocated based on FWB rules after running the Automated Fulfillment Process OR you can use the Ready to Fulfill flag OR you can use Automated Fulfillment Rules with Load Queue Action
If the site has ready to fulfill required, there is new logic to not allow you to load a job material that is not ready to fulfill (same with transfers) and this matches the order release FWB functionality.
So the tab will show up with AMM under Job Material and the Ready to Fulfill was added to allow for Auto Allocation using the Automated Fulfillment Process
They’ve confirmed this was introduced in 2023.1.4.