projectDir not working as expected

package.json

  "devDependencies": {
    "serverless": "^2.61.0",
  },

serverless.yaml

service: SomeServices
variablesResolutionMode: 20210326
projectDir: ../
useDotenv: true
configValidationMode: warn

custom:
  deploymentBucket:
    policy: ${file(../serverless-deploymentBucketPolicy.json)}

I get the error:

"custom.deploymentBucket": Cannot load file from outside of service folder

Am I doing something wrong or am I encountering a bug?

It seems like this was resolved by installing the latest canary version of serverless (“2.61.0-05f937f2”).