CheckYamlStrict complains about patch_optional and status if used in dependency

Example project config:

tasks:

  - name: taskA

    commands:

      - command: shell.exec

        params:

          script: |

            echo hello

  - name: taskB

    commands:

      - command: shell.exec

        params:

          script: | 

            echo goodbye

buildvariants:

  - name: some_buildvariant

    run_on:

    - ubuntu1604-small

    tasks:

    - name: taskA

    - name: taskB

      depends_on:

        - name: taskA

          patch_optional: true

          status: "*"

If I run evergreen validate on this config, it gives this warning during CheckYamlStrict:
WARNING: yaml: unmarshal errors:
line 24: field patch_optional not found in struct model.copyType
line 24: field status not found in struct model.copyType

It gives the same error if you specify depends_on in the task definition instead of the buildvariant task list. However, if you call LoadProjectInto, the actual model.Project result has PatchOptional and Status properly populated for that dependency.