How to only use default values when the chart has a custom values file

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Summary The chart has a custom values file, and dashboard only display custom values, but I want to use defaults.

Background and rationale

• rook-ceph-cluster added an external custom values file and released https://github.com/rook/rook/commit/3e61efc97611d03c3723607f245c3ab974fef52e

• kubeapps will merge custom values in this release https://github.com/vmware-tanzu/kubeapps/releases/tag/v2.6.3

Description I deployed rook-ceph-cluster with default values via kubeapps. After they added an external custom values file, upgrade form only display custom values, that's leads wrong values. Deploy new rook-ceph-cluster chart also uses custom values and not usable. Additional context I tried rollback to v2.6.0, but when I click into upgrade, shows An error occurred: Document with errors cannot be stringified. , it's ok in v2.8.0