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Hello, I've just had a strange behaviour during an `update` : I tried to update a stack which had no changes and it tried to delete some resource : 
```$ pulumi update
Previewing update of stack 'prod'
Previewing changes:

   Type  Name  Plan     Info
 
info: no changes required:
      9 resources unchanged

Do you want to perform this update? yes
Updating stack 'prod'
Performing changes:

     Type                 Name               Status                  Info
 *   pulumi:pulumi:Stack  first-pulumi-prod  done                    
 --  └─ aws:rds:Instance  base_c             **deleting failed**     2 errors
 
Diagnostics:
  aws:rds:Instance: base_c
    error: Plan apply failed: deleting urn:pulumi:prod::first-pulumi::aws:rds/instance:Instance::base_c: DB Instance FinalSnapshotIdentifier is required when a final snapshot is required
 
    error: update failed
 
info: no changes required:
      9 resources unchanged

Permalink: <https://app.pulumi.com/jnancel/prod/updates/13>
error: update failed
```
That's a pretty scary behavior. Any idea what might have happened ?