Created attachment 1663508 [details]
Install plan detail

Description of problem:

When I try to install an older version of an operator, for example Service Mesh 1.0.6, it's not possible to approve it because after clicking on "1 requires approval" the OCP console returns an error page: "404: Page Not Found"
However, the installplan exists (checked via oc get installplan -n openshift-operators) and it's possible to approve it via CLI.

I'll attach screenshots.

Version-Release number of selected component (if applicable):

OCP 4.3.1

How reproducible:

Steps to Reproduce:
1. Use the following subscription to install Service Mesh and apply it via CLI

apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata:
  name: servicemeshoperator
  namespace: openshift-operators
spec:
  channel: "1.0"
  installPlanApproval: Manual
  name: servicemeshoperator
  source: redhat-operators
  sourceNamespace: openshift-marketplace
  startingCSV: servicemeshoperator.v1.0.6

2. Go to UI: Operators -> Installed Operators (in openshift-operators namespace)
3. Click "1 requires approval"

Actual results:

Error page.

Expected results:

The page shows details of the installplan and I'm able to click "Approve"

Additional info: