Description of problem:
Failed to update from a head of the channel.

Version-Release number of selected component (if applicable):
Cluster version is 4.2.0-0.nightly-2019-09-11-032939
mac:~ jianzhang$ oc exec catalog-operator-68f64f5465-lz4rq -- olm --version
OLM version: 0.11.0
git commit: 95572bce2416891c270c90a4437dc4a121a43e72

How reproducible:
always

Steps to Reproduce:

1, Create the manifest, see: https://github.com/jianzhangbjz/operator-registry/tree/olm-1055/manifests/etcd 

Define the "olm.skipRange: > 0.6.0 < 0.9.9", but no "replace", in the v0.9.0 operator csv.
Define the "replaces: etcdoperator.v0.9.0", but no "olm.skipRange" in the v0.9.2 operator csv.
Define the "olm.skipRange: !0.9.2" and "replaces: etcdoperator.v0.9.2" in the v0.9.4 operator csv.

2, Build them into an image and push it to Quay.io: quay.io/jiazha/etcd-operator:v0.6.1-skip
mac:operator-registry jianzhang$ docker build -f upstream-example.Dockerfile -t quay.io/jiazha/etcd-operator:v0.6.1-skip .

3. Create a CatatlogSource, which consume the above image. Like below:
mac:~ jianzhang$ cat cs-42.yaml 
apiVersion: operators.coreos.com/v1alpha1
kind: CatalogSource
metadata:
  name: test-operator
  namespace: default
spec:
  sourceType: grpc
  image: quay.io/jiazha/etcd-operator:v0.6.1-skip
  displayName: Test Operators
  publisher: Test

mac:~ jianzhang$ oc create -f cs-42.yaml 
catalogsource.operators.coreos.com/test-operator created
mac:~ jianzhang$ oc get catalogsource 
NAME            DISPLAY          TYPE   PUBLISHER   AGE
test-operator   Test Operators   grpc   Test        66s

4. Create an OperatorGroup in project default.
mac:~ jianzhang$ oc get og -n default
NAME      AGE
test-og   147m
mac:~ jianzhang$ cat og.yaml 
apiVersion: operators.coreos.com/v1
kind: OperatorGroup
metadata:
  name: test-og
  namespace: default
spec:
  targetNamespaces:
  - default

5. Subscribe the etcd-operator, which a low version. For example, v0.6.1

mac:~ jianzhang$ cat sub-42.yaml 
apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata:
 generateName: etcd-skip-
 namespace: default
spec:
 source: test-operator
 sourceNamespace: default
 name: etcd
 startingCSV: etcdoperator.v0.6.1
 channel: singlenamespace-alpha


Actual results:
The version of the etcd-operator is 0.6.1, it should be updated to v0.9.4.
mac:~ jianzhang$ oc get sub -n default
NAME              PACKAGE   SOURCE          CHANNEL
etcd-skip-xv6bh   etcd      test-operator   singlenamespace-alpha
mac:~ jianzhang$ oc get csv -n default
NAME                  DISPLAY   VERSION   REPLACES   PHASE
etcdoperator.v0.6.1   etcd      0.6.1                Succeeded


Expected results:
The etcd-operator should be upgraded to v0.9.4 automatically.

Additional info:
The related logs:
time="2019-09-12T05:39:05Z" level=info msg="error updating subscription status" channel=singlenamespace-alpha error="Operation cannot be fulfilled on subscriptions.operators.coreos.com \"etcd-skip-xv6bh\": the object has been modified; please apply your changes to the latest version and try again" id=yzw/n namespace=default pkg=etcd source=test-operator sub=etcd-skip-xv6bh
E0912 05:39:05.722794       1 queueinformer_operator.go:282] sync "default" failed: error updating Subscription status: Operation cannot be fulfilled on subscriptions.operators.coreos.com "etcd-skip-xv6bh": the object has been modified; please apply your changes to the latest version and try again
time="2019-09-12T05:39:06Z" level=info msg=syncing event=update reconciling="*v1alpha1.Subscription" selflink=/apis/operators.coreos.com/v1alpha1/namespaces/default/subscriptions/etcd-skip-xv6bh