when you are using global.identityTrustAnchorsPEM in set parameter in terraform the proxy sidecar validation get error in these line
with Please provide the identity trust anchors error.
this pr fix the issue on terraform 0.14.
https://github.com/linkerd/linkerd2/blob/48c5f70c399aeaa45ee125deca2253a3f9ce96e4/charts/partials/templates/_proxy.tpl#L73