Odoo18-Base/addons/theme_default/data/generate_primary_template.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>

<!-- Generate primary snippet templates that are not predefined -->
<function model="ir.module.module" name="_generate_primary_snippet_templates">
    <value eval="[ref('base.module_theme_default')]"/>
</function>

</odoo>