Unbound corrupt root.key file

[tjsober]

SG-5100
22.01-RELEASE

Just reinstalled 22.01 and brought over the config from a second SG-5100 that does NOT exhibit this error.

I am getting the following error on boot:

 rc.bootup: Unbound /var/unbound/root.key file is corrupt, removing and recreating. 

and also this error whenever I restart unbound:

 /status_services.php: Unbound /var/unbound/root.key file is corrupt, removing and recreating. 

I tried the commands in this link to recreate the file:

https://forum.netgate.com/post/510554

But the error persists. If I cat /var/unbound/root.key it is a single line:

 . IN DS 20326 8 2 E06D44B80B8F1D3[...]

whereas on the other SG-5100 it is multi-line including comments and dates and a long key string.

Could someone please help me figure out what I am doing wrong and how to fix this.