Description of problem:
podman run -it --entrypoint /bin/bash quay.io/openshift/origin-operator-registry:4.6.0
opm index export -i quay.io/olmqe/etcd-index:0.9.2 -f etcd -o etcd # no longer allowed
opm index export -i quay.io/olmqe/etcd-index:0.9.2 etcd # creates etcd/etcd/ directory instead of etcd/

Version-Release number of selected component (if applicable):
container: podman images
quay.io/openshift/origin-operator-registry   4.6.0   8e7989e73bcd   24 hours ago   1.1 GB

Inside container:
opm version
Version: version.Version{OpmVersion:"", GitCommit:"", BuildDate:"2020-09-21T15:33:46Z", GoOs:"linux", GoArch:"amd64"}

How reproducible:
always

Steps to Reproduce:
1. podman run -it --entrypoint /bin/bash quay.io/openshift/origin-operator-registry:4.6.0
2. opm index export -i quay.io/olmqe/etcd-index:0.9.2 -f etcd -o etcd # fails
3. opm index export -i quay.io/olmqe/etcd-index:0.9.2 -f etcd  etcd # succeeds with wrong result


Actual results:
bash-4.4$ ls etcd/
etcd

Expected results:
bash-4.4$ ls etcd/
package.yaml   0.9.2   0.9.4

Additional info:
https://polarion.engineering.redhat.com/polarion/#/project/OSE/workitem?id=OCP-30189

workaround to make existing scripts work
run step 3
mv etcd tmp
mv tmp/etcd ./etcd