PAN-OS devices will not commit configurations that hard code interfaces to full duplex when speed is set to 1000. The commit will fail with the following error:
Cause
The commit fails because the Gigabit Ethernet specification requires auto-negotiation. Explicitly specifying 1000/full is technically an invalid configuration.
In previous versions of PAN-OS, the device accepts 1000/full during validation and will commit 1000/auto even if full duplex is specified.