rancher: Cannot edit load-balancer or service discovery yaml

What kind of request is this (question/bug/enhancement/feature request): bug

Steps to reproduce (least amount of steps as possible): Upgrade Rancher v. 2.1.7 to 2.2.2 and then try to edit Load Balance via “View/Edit Yaml” option.

Result: You will see an “[Object object]” error in popup, instead of actual yaml.

Other details that may be helpful: Chrome console gives error: net::ERR_SPDY_PROTOCOL_ERROR 200

Workloads yaml editor works fine.

Environment information

• Rancher version (rancher/rancher/rancher/server image tag or shown bottom left in the UI): 2.2.2
• Installation option (single install/HA): HA

Cluster information

• Cluster type (Hosted/Infrastructure Provider/Custom/Imported): Custom
• Machine type (cloud/VM/metal) and specifications (CPU/memory): metal, 2x12 CPU, 2x32 Gb RAM
• Kubernetes version (use kubectl version):

Client Version: version.Info{Major:"1", Minor:"11", GitVersion:"v1.11.3", GitCommit:"a4529464e4629c21224b3d52edfe0ea91b072862", GitTreeState:"clean", BuildDate:"2018-09-10T11:44:36Z", GoVersion:"go1.11", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"13", GitVersion:"v1.13.4", GitCommit:"c27b913fddd1a6c480c229191a087698aa92f0b1", GitTreeState:"clean", BuildDate:"2019-02-28T13:30:26Z", GoVersion:"go1.11.5", Compiler:"gc", Platform:"linux/amd64"}

• Docker version (use docker version):

Client:
 Version:           18.09.5
 API version:       1.39
 Go version:        go1.10.8
 Git commit:        e8ff056
 Built:             Thu Apr 11 04:43:57 2019
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          18.09.5
  API version:      1.39 (minimum version 1.12)
  Go version:       go1.10.8
  Git commit:       e8ff056
  Built:            Thu Apr 11 04:10:53 2019
  OS/Arch:          linux/amd64
  Experimental:     false