istio: String field 'istio.mixer.v1.ReportRequest.default_words' contains invalid UTF-8 Data

Bug description

After upgrading to istio 1.3.0 some of my pods are throwing this error

[libprotobuf ERROR external/com_google_protobuf/src/google/protobuf/wire_format_lite.cc:603] String field ‘istio.mixer.v1.ReportRequest.default_words’ contains invalid UTF-8 data when serializing a protocol buffer. Use the ‘bytes’ type if you intend to send raw bytes.

Affected product area (please put an X in all that apply)

[X] Configuration Infrastructure [ ] Docs [ ] Installation [ ] Networking [ ] Performance and Scalability [ ] Policies and Telemetry [ ] Security [X] Test and Release [ ] User Experience [ ] Developer Infrastructure

Expected behavior

Steps to reproduce the bug

Version (include the output of istioctl version --remote and kubectl version) client version: 1.3.0 citadel version: 1.3.0 citadel version: 1.3.0 egressgateway version: 1.3.0 galley version: 1.3.0 galley version: 1.3.0 ingressgateway version: 1.3.0 ingressgateway version: 1.3.0 pilot version: 1.3.0 pilot version: 1.3.0 pilot version: 1.3.0 pilot version: 1.3.0 policy version: 1.3.0 policy version: 1.3.0 sidecar-injector version: 1.3.0 telemetry version: 1.3.0 telemetry version: 1.3.0

Server Version: version.Info{Major:“1”, Minor:“14+”, GitVersion:“v1.14.6-eks-5047ed”, GitCommit:“5047edce664593832e9b889e447ac75ab104f527”, GitTreeState:“clean”, BuildDate:“2019-08-21T22:32:40Z”, GoVersion:“go1.12.9”, Compiler:“gc”, Platform:“linux/amd64”}

How was Istio installed? Helm

Environment where bug was observed (cloud vendor, OS, etc) AWS EKS v1.14

Additionally, please consider attaching a cluster state archive by attaching the dump file to this issue.