Indeed if you take the 9.3 AMI, then do a yum/dnf update, it will update to 9.4 and reboots without issues.
One thing that I noticed is that the 9.4 AMI is not mentionned on Download - Rocky Linux
It only exists on AWS public images with the Rocky Linux account “792107900819”
The “aws-marketplace” account owner “679593333241” doesn’t have the 9.4 AMI, probably because the 9.4 AMI provided by Rocky Linux team is faulty, thus not passing AWS validation.
I’m now thinking if I should use aws 679593333241 instead of rocky 792107900819 for my packer and terraform datasources, if that can free me from some troubles in the future.