When the vpxd service crashes, a core dump file (example - core.vpxd-worker.#######) is created in /var/core/ on the vCenter.
This issue occurs due to a combination of VM clone and configure operation causing the vpxd service to crash.
To isolate Cluster API operation
1. Do a simple clone operation (no changes to the VM device/disk properties)
2. Once the step 1 simple clone completes, perform the configuration changes on the cloned VM