Disconnected Cluster with 800+ VMs pulling CNV must-gather container through a proxy registry

CNV must-gather hangs for a long time here and doesn't seem to complete with active VMs:
$ oc adm must-gather --image=<proxy>/container-native-virtualization/cnv-must-gather-rhel8:v4.8.2
[must-gather ] OUT Using must-gather plug-in image: <proxy>/container-native-virtualization/cnv-must-gather-rhel8:v4.8.2
[must-gather ] OUT namespace/openshift-must-gather-5ssk5 created
[must-gather ] OUT clusterrolebinding.rbac.authorization.k8s.io/must-gather-x2kgd created
[must-gather ] OUT pod for plug-in image <proxy>container-native-virtualization/cnv-must-gather-rhel8:v4.8.2 created
[must-gather-x8w9j] POD 2021-10-05T15:40:16.299949683Z Inspecting resource ns/openshift-cnv...
[must-gather-x8w9j] POD 2021-10-05T15:41:12.373479846Z Inspecting resource ns/kubevirt-hyperconverged...
[must-gather-x8w9j] POD 2021-10-05T15:41:12.470425609Z Inspecting resource ns/openshift-operator-lifecycle-manager...
[must-gather-x8w9j] POD 2021-10-05T15:41:20.454569154Z Inspecting resource ns/openshift-marketplace...
[must-gather-x8w9j] POD 2021-10-05T15:41:26.394835061Z Inspecting resource ns/cluster-network-addons...
[must-gather-x8w9j] POD 2021-10-05T15:41:26.498061429Z Inspecting resource ns/openshift-sdn...
[must-gather-x8w9j] POD 2021-10-05T15:41:39.799455454Z Inspecting resource ns/sriov-network-operator...
[must-gather-x8w9j] POD 2021-10-05T15:41:39.901276929Z Inspecting resource ns/kubevirt-web-ui...
[must-gather-x8w9j] POD 2021-10-05T15:41:39.999049443Z Inspecting resource catalogsource...
[must-gather-x8w9j] POD 2021-10-05T15:41:40.125760274Z Inspecting resource clusterserviceversion...
[must-gather-x8w9j] POD 2021-10-05T15:41:40.387470450Z Inspecting resource virtualmachineinstances...
[must-gather-x8w9j] POD 2021-10-05T15:41:43.457467862Z Inspecting resource virtualmachineinstancereplicasets...
[must-gather-x8w9j] POD 2021-10-05T15:41:43.582086997Z Inspecting resource virtualmachineinstancepresets...
[must-gather-x8w9j] POD 2021-10-05T15:41:43.713515435Z Inspecting resource virtualmachineinstancemigrations...
[must-gather-x8w9j] POD 2021-10-05T15:41:43.846747532Z Inspecting resource v2vvmwares...
[must-gather-x8w9j] POD 2021-10-05T15:41:44.000414601Z Inspecting resource virtualmachineimports...
[must-gather-x8w9j] POD 2021-10-05T15:41:44.133910674Z Inspecting resource Network-attachment-definitions...
[must-gather-x8w9j] POD 2021-10-05T15:41:44.263851558Z Inspecting resource networkaddonsconfig...
[must-gather-x8w9j] POD 2021-10-05T15:41:44.393192747Z Inspecting resource ns/cdi...
[must-gather-x8w9j] POD 2021-10-05T15:41:44.490933854Z Inspecting resource datavolumes...
[must-gather-x8w9j] POD 2021-10-05T15:41:45.923284313Z Inspecting resource nodenetworkstates...
[must-gather-x8w9j] POD 2021-10-05T15:41:46.213452916Z Inspecting resource nodenetworkconfigurationenactments...
[must-gather-x8w9j] POD 2021-10-05T15:41:46.378493448Z Inspecting resource nodenetworkconfigurationpolicies...
[must-gather-x8w9j] POD 2021-10-05T15:41:46.570024717Z Inspecting resource istag...
[must-gather-x8w9j] POD 2021-10-05T15:41:46.743161333Z Inspecting resource nodes...
[must-gather-x8w9j] POD 2021-10-05T15:41:47.120223937Z Inspecting resource machines...