VMware backup not using SAN mode (falls back to NBD) (4046911)

Although the VMware plugin is configured to use "SAN" Transport Mode, some backup jobs continually fallback to NBD (Network Block Device) mode. The following log entry is evidence of this mode of operation -

VM disk '[DataStore_Name]DiskName .vmdk' opened in 'nbd' mode.

Trace may show:
2019-06-10T15:51:00.979-04:00| host-9160| I125: FILE: FileCreateDirectoryRetry: Non-retriable error encountered (C:\Users\NV_BU_~1\AppData\Local\Temp\vmware-nv_bu_service_acc\4232109d-4ef1-ba8b-8fd5-28d49a31d716-vm-123595): Cannot create a file when that file already exists (183) 2019-06-10T15:51:00.979-04:00| host-9160| I125: FILE: FileCreateDirectoryEx: Failed to create C:\Users\NV_BU_~1\AppData\Local\Temp\vmware-nv_bu_service_acc\4232109d-4ef1-ba8b-8fd5-28d49a31d716-vm-123595. Error = 17

2019-06-10T15:51:00.979-04:00| host-9160| I125: 2019-06-10T15:51:00.979-04:00 error -[09160] [Originator@6876 sub=Default] Cannot use advanced transport modes for 10.118.8.200/moref=vm-123595/snapshot-193277: Cannot create directory C:\Users\NV_BU_~1\AppData\Local\Temp\vmware-nv_bu_service_acc\4232109d-4ef1-ba8b-8fd5-28d49a31d716-vm-123595.