@aaPanel_Kern on top of that, I deleted on of the sites and domain completely. This domain was included in the SSL wildcard.
Now after removal, the SSL is still trying to renew the removed domain causing renewal error.
I deleted SSL and tried to recreate - same issue.
I deleted /www/server/panel/config/letsencrypt_v2.json file but problem remains.
Where is this domain stored? It's not present on the Websites list, it's not attached to any existing sites but still is somehow visible to the letsencrypt script. How to delete the domain then?