Currently the module checks if the field is being used for access control to check if a permissions rebuild is necessary. This is done by checking two fields, the node_access_user_term_access field and the node_access_user_term_operations field.

Currently a rebuild is triggered when the operations field changes even if the checkbox for using this field for access control isn't ticked.

This should check the value of the node_access_user_term_access field first to see if the field is being used for access control, then check the values of node_access_user_term_operations field.