They don’t really manifest as errors, because Nomad is opaque in this way. When you try and schedule something that can’t yet work, Nomad just hangs out to see if it can push it through at a later time. It will happily sit there for days and then finish your deploy if it can.
Apps on Machines are much more transparent about this kind of issue, once we get existing Nomad apps migrated over: Fly Apps on machine prerelease