(Presumably since Helm 2.8.0 or later), upgrading a HelmRelease with

upgrade:
  force: true

fails with this error: invalid operation: cannot use force conflicts and force replace together. This seems to come out of helm: https://github.com/helm/helm/blob/main/pkg/kube/client.go#L818C33-L818C105

A possible train of thought (just grepping through the source code):

• Since some time (1.5.0), helm-controller defaults to server-side apply. (from Changelog).
• That sets forceConflicts always to true. (

  helm-controller/internal/action/upgrade.go

  Line 77 in 8a0f9d0

  upgrade.ForceConflicts = serverSideApply // We always force conflicts on server-side apply.

  )
• "upgrade.force: true" sets forceReplace also to true (

  helm-controller/internal/action/upgrade.go

  Line 119 in 8a0f9d0

  upgrade.ForceReplace = obj.GetUpgrade().Force

  )
• and that triggers that check in Helm.