Changing subnet mask reset my core switch, yay.

Running 7.4.11 and I went into the main vlan and changed the scope from /24 to a /23 and my 248e-poe running 7.4.9 decided to disassociate from the fortigate. I had to go into the backup admin port that comes default out of the box, logged into the fortigate and saw the switch was now asking to authorized. I hit authorize and the switch shows up with default configs - __-

Thankfully I did a backup and just restored but, damn, what a feature.