'Helm values.yaml issue

I have a Helm chart containing the following contents:

# parentchart/charts/subchart/templates/test.yaml
chart: {{ .Values }}

# parentchart/values.yaml
xyz: def
subchart:
  abc:
    param:
  ankit: kansal

# parentchart/charts/subchart/values.yaml
abc:
     param1:
ankit: kansal

But while templating this chart using values.yaml and in other case without using values.yaml. I am seeing different values of .Values.

Scenario 1, without passing values.yaml: if I run helm template fm parentchart it outputs

---
# Source: parentchart/charts/subchart/templates/test.yaml

chart: map[abc:map[param:<nil> param1:<nil>] ankit:kansal global:map[]]

Scenario 2, passing the following values.yaml:

# values.yaml
xyz: def
subchart:
  abc:
    param:
  ankit: kansal

helm template fm parentchart -f values.yaml outputs:

---
# Source: parentchart/charts/subchart/templates/test.yaml

chart: map[abc:map[param1:<nil>] ankit:kansal global:map[]]

Not sure why I'm not getting "param" as nil in Scenario 2 as I have passed the same in values.yaml from outside.

Sources

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