unable to execute generate_masking_script in EMCLI after upgrade to EM 13.4

We are wrapping up migration of our EM environment from 13.2 to 13.4.

We use data masking, and have some simple EMCLI jython scripts that perform the following :

Import masking definition (XML) files. (using import_masking_definition )

Generate masking scripts : (using generate_masking_script )

Save generated scripts: (using save_masking_script )

The import and save commands can be run successfully either interactively or via script.

The generate script command fails regardless of method of invocation, and the error output is this:

"The operation cannot be performed, either all columns disabled or format is not defined for enabled column.Please have format defined with enabled status columns"