This issue has been reported multiple times over the years with no resolution
https://prow.ci.openshift.org/view/gs/origin-ci-test/logs/periodic-ci-openshift-release-master-nightly-4.13-e2e-vsphere-zones/1655633815252504576

kubeconfig received!
waiting for api to be available
level=error
level=error msg=Error: failed to parse ovf: failed to parse ovf: XML syntax error on line 1: illegal character code U+0000
level=error
level=error msg= with vsphereprivate_import_ova.import[0],
level=error msg= on main.tf line 70, in resource "vsphereprivate_import_ova" "import":
level=error msg= 70: resource "vsphereprivate_import_ova" "import" {
level=error
level=error
level=error msg=Error: failed to parse ovf: failed to parse ovf: XML syntax error on line 1: illegal character code U+0000

https://issues.redhat.com/browse/OCPQE-13219
https://issues.redhat.com/browse/TRT-741