vCSA Update Abruptly Stops at "Converting Data 80%"

While updating one of my vCSAs from Update 3j to 3l, the update process would abruptly stop at “Converting Data 80%”.  

This status window would just disappear, no warning or failure messages.  This occurred twice...  Surprisingly, the partner vCSA in enhanced linked mode was built at the same time with the same version upgraded without issue.

The following 2 logs should be used to determine if the update was successfully completed:

1. /var/log/vmware/applmgmt/update_microservice.log

2021-03-17 18:13:09,367 - update_script_day0_patching - DEBUG - Patching completed successfully

2021-03-17 18:13:09,368 - vmware.update.extensions - DEBUG - The component script returned 'None'

2021-03-17 18:13:09,374 - vmware.appliance.update.update_b2b - DEBUG - update script result file '{\n    "error": null,\n    "info": [],\n    "progress": 100,\n    "progress_message": null,\n    "status": "success",\n    "warning": []\n}

'

2021-03-17 18:13:09,374 - vmware.appliance.update.update_functions - DEBUG - /var/vmware/applmgmt/patch-history directory created successfully

2021-03-17 18:13:09,388 - vmware.appliance.update.update_b2b - INFO - Setting appliance version 6.7.0.46000 build 17138064

2021-03-17 18:13:09,391 - vmware.appliance.update.update_b2b - DEBUG - Appliance version is updated for login banner

2021-03-17 18:13:09,394 - vmware.appliance.update.update_functions - DEBUG - Running /usr/bin/banner_ctrl reset

2021-03-17 18:13:16,146 - /usr/lib/applmgmt/update/py/vmware/appliance/update/task_manager.py - DEBUG - UpdateTask: status=SUCCEEDED, progress=100, message={'id': 'com.vmware.appliance.install_complete', 'default_message': 'Installation

complete', 'args': []}

2021-03-17 18:13:16,153 - vmware.appliance.update.update_b2b - DEBUG - Installation completed successfully!

2021-03-17 18:13:16,153 - vmware.appliance.update.update_functions - DEBUG - Running reboot

2021-03-17 18:13:21,928 - __main__ - DEBUG - Event callback succeeded

2. /var/log/vmware/applmgmt/upgrade_hook_PatchHook

{

    "info": [],

    "progress_message": null,

    "warning": [],

    "status": "success",

    "error": null,

    "progress": 100

}

This appears to be a "cosmetic" issue and the upgrade completed successfully.