Section validation running before button with associated validation group is pressed.

We are using Appian 16.2 and I noticed by creating a small test case that section validations run before any buttons are pressed regardless of whether it has an associated validation group. The test case I am using is copied below. Am I doing something wrong here or is there some other way to make a validation only trigger when a certain button is pressed?

a!formLayout(
  label: "Test",
  firstColumnContents: {
    a!sectionLayout(
      label: "",
      firstColumnContents: {},
      validations: "Test",
      validationGroup: "SUBMIT"
    )
  },
  buttons: a!buttonLayout(
    primaryButtons: {
      a!buttonWidgetSubmit(
        label: "Save",
        value: "save",
        saveInto: ri!button_value,
        validationGroup: "SUBMIT"
      )
    }
  )
)