Overriding Templates Breaking after Plugin Updates

Question to the plugin authors:
Is there a better way to structure template files so that we do not continue to have our overriding templates break whenever a template file is updated in the plugin?

We have had two instances where plugin updates have impacted our sites membership directory.

In each case we have a custom theme overriding members-grid.php following the recommendation here:
https://docs.ultimatemember.com/article/1516-templates-map

Our most recent breakage was the result of the following line being added to members-grid.php:
$unique_hash = substr( md5( $args['form_id'] ), 10, 5 );

$unique_hash is used throughout the members-grid.php file update.

This is a problem because $unique_hash is not in our overriding members-grid.php file.

The result is that our directory no longer displays any members and we have an error:
Cannot read property 'replace' of undefined

I am nervous about continuing using Ultimate Members if this continues to happen after the plugin is updated.

Any help or guidance is greatly appreciated.