Load partials not needing globals. Just pass arguments to the functions.

fcg-partial.php

<?php
/**
 * @wordpress-plugin
 * Plugin Name: FCG Partials.
 * Description: Do not depend on globals to pass variables to template parts.
 * Version:     1.0.0
 * Author:      Gulbenkian
 * Author URI:  https://github.com/gulbenkian/
 * License:     GPL-2.0+
 */

if ( ! function_exists( 'fcg_parcial' ) ) {

	/**
	 * Use template partials with parameters.
	 *
	 * No need for globals, pass the parameters to the function.
	 *
	 * @todo  Add caching based on partial and arguments.
	 *
	 * @since  1.0.0
	 *
	 * @param  string $partial_template
	 * @param  array $arguments
	 * @return void
	 */
	function fcg_partial( string $partial_template, array $arguments = [] ) {

		/**
		 * Change location of the partial.
		 *
		 * A custom location (folder) can be defined using the filter.
		 *
		 * @since 1.0.0
		 *
		 * @param  string $prefix            Defined prefix.
		 * @param  array  $arguments         The passed arguments.
		 * @param  string $partial_template  Partial name.
		 * @return string                    New prefix.
		 */
		$prefix = apply_filters( 'fcg_partial_prefix', '', $arguments, $partial_template );

		$__partial = locate_template( [ $prefix . $partial_template . '.php' ], false );

		if ( empty( $__partial ) ) {
			return false;
		}

		if ( ! is_readable( $__partial ) ) {
			return false;
		}

		/**
		 * Change partial arguments.
		 *
		 * @since 1.0.0
		 *
		 * @param  array  $arguments         The passed arguments.
		 * @param  string $partial_template  Partial name.
		 * @return array                     Updated arguments list.
		 */
		$arguments = apply_filters( 'fcg_partial_arguments', $arguments, $partial_template );

		if ( ! empty( $arguments ) ) {
			// phpcs:disable WordPress.PHP.DontExtract.extract_extract
			extract( $arguments );
			// phpcs:enable WordPress.PHP.DontExtract.extract_extract
		}

		include $__partial;
	}
}

if ( ! function_exists( 'get_fcg_parcial' ) ) {

	/**
	 * Return the content of the template partial.
	 *
	 * @since 1.0.0
	 *
	 * @param  string $partial_template
	 * @param  array  $arguments
	 * @return string
	 */
	function get_fcg_partial( string $partial_template, array $arguments = [] ) {
		ob_start();
		fcg_partial( $partial_template, $arguments );
		$content = ob_get_clean();

		/**
		 * Change the output from the partial.
		 *
		 * @since 1.0.0
		 *
		 * @param  string $content          The rendered partial.
		 * @param  array  $arguments        List of arguments passed to the partial.
		 * @param  string $partial_template Partial name.
		 * @return string                   Updated rendered partial.
		 */
		return apply_filters( 'fcg_partial_content_after', $content, $arguments, $partial_template );
	}
}