Unable to upgrade local-path-provisioner chart

I'm trying to upgrade local-path-provisioner chart from v0.0.14 to v0.0.20 in order to upgrade flux (#879 (closed)).

The local-path-provisioner pod crashloops with:

 Incorrect Usage: flag provided but not defined: -service-account-name                                                                                                                
 NAME:                                                                                                                                                                                
 time="2021-09-06T16:38:46Z" level=fatal msg="Critical error: flag provided but not defined: -service-account-name"                                                                  
    local-path-provisioner start -     

The new chart uses this command in templates/deployment.yaml which is incompatible with our old local-path-provisioner image:

 command:
   - local-path-provisioner
   - --debug
   - start
   - --config
   - /etc/config/config.json
   - --service-account-name
   - {{ template "local-path-provisioner.serviceAccountName" . }}
   - --provisioner-name
   - {{ template "local-path-provisioner.provisionerName" . }}
   - --helper-image
 {{- if .Values.privateRegistry.registryUrl }}
   - "{{ .Values.privateRegistry.registryUrl }}/{{ .Values.helperImage.repository }}:{{ .Values.hel
 {{- else }}
   - "{{ .Values.helperImage.repository }}:{{ .Values.helperImage.tag }}"
 {{- end }}
   - --configmap-name
   - {{ .Values.configmap.name }}

The local-path-provisioner binary from our custom image only has these parameters:

# local-path-provisioner start --help
NAME:
   local-path-provisioner start - 

USAGE:
   local-path-provisioner start [command options] [arguments...]

OPTIONS:
   --config value            Required. Provisioner configuration file.
   --provisioner-name value  Required. Specify Provisioner name. (default: "rancher.io/local-path") [$PROVISIONER_NAME]
   --namespace value         Required. The namespace that Provisioner is running in (default: "local-path-storage") [$POD_NAMESPACE]
   --helper-image value      Required. The helper image used for create/delete directories on the host (default: "busybox") [$HELPER_IMAGE]