Helm - deep merge in containers field in chart with two deployments - kubernetes-helm

Question

I have library chart:
# only part from it
containers:
- name: {{ .Chart.Name }}
{{- if .Values.config.command }}
command: {{ .Values.config.command }}
{{- end }}
resources:
{{- toYaml .Values.config.resources | nindent 10 }}
{{- if .Values.config.containerPort}}
ports:
- containerPort: {{ .Values.config.containerPort }}
{{- end}}
envFrom:
{{- if .Values.config.envFrom }}
{{- toYaml .Values.config.envFrom | nindent 10 }}
{{- end }}
...
# from the Common Helm Helper Chart
{{- define "common-chartlib.deployment" -}}
{{- include "common-chartlib.util.merge" (append . "common-chartlib.deployment.tpl") -}}
{{- end -}}
There is application chart that contains two deployments that differs only with command field value:
# values
command1: ["123"]
command2: ["456"]
# deployment1
spec:
containers:
- name: deployment1
command: {{ .Values.config.command1 }}
# deployment2
spec:
containers:
- name: deployment1
command: {{ .Values.config.command2 }}
If I run helm template I will get:
containers:
- command:
- 123
name: backend
# other fields like ports, envFrom, resources were removed
volumes:
- name: backend-private-key
secret:
secretName: backend-private-key
As you see all fields except name and command were removed after merging.
Expected result:
containers:
- command:
- 123
name: backend
# other fields taken from library chart like ports, envFrom, resources must NOT be removed
ports:
- containerPort: 8000
envFrom:
- configMapRef:
name: backend
volumes:
- name: backend-private-key
secret:
secretName: backend-private-key
Output of helm version:
version.BuildInfo{Version:"v3.8.0", GitCommit:"d14138609b01886f544b2025f5000351c9eb092e", GitTreeState:"clean", GoVersion:"go1.17.6"}
Output of kubectl version:
Client Version: version.Info{Major:"1", Minor:"22", GitVersion:"v1.22.2", GitCommit:"8b5a19147530eaac9476b0ab82980b4088bbc1b2", GitTreeState:"clean", BuildDate:"2021-09-15T21:31:32Z", GoVersion:"go1.16.8", Compiler:"gc", Platform:"darwin/amd64"}
Please help.