How do I remove the action of a menu.xml item?

Question

Using Magento 2.2.5.

I have an 3rd party extension admin menu item that should be a header, but has an action so is rendering as a link (which 404s). Is there a way to override the menu.xml item and remove the action property?

In my custom module I have basically the same definition but removing the action property:

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Backend:etc/menu.xsd">
    <menu>
        <update id="Third_Party::menu" title="Succesfully overriding the title" module="Third_Party" sortOrder="101" parent="Magento_Catalog::catalog" resource="Third_Party::menu" />
    </menu>
</config>

While my custom module's menu.xml update is being picked up and the title is changing, the xml is inheriting the action property from the Third_Party/etc/adminhtml/menu.xml file.