MU WPCOM: Add more defensive checks when loading the Coming Soon feat…

…ure (#41273)

projects/packages/jetpack-mu-wpcom/changelog/update-jetpack-mu-wpcom-load-coming-soon-remove-etk-version-check

@@ -0,0 +1,4 @@
+Significance: patch
+Type: changed
+
+Coming Soon: Add more checks to the ETK version comparison.

projects/packages/jetpack-mu-wpcom/src/class-jetpack-mu-wpcom.php

@@ -276,9 +276,13 @@ public static function load_coming_soon() {
 		 * Explicitly pass $markup = false in get_plugin_data to avoid indirectly calling wptexturize that could cause unintended side effects.
 		 * See: https://developer.wordpress.org/reference/functions/get_plugin_data/
 		 */
+		$fse_plugin                 = 'full-site-editing/full-site-editing-plugin.php';
+		$fse_plugin_path            = WP_PLUGIN_DIR . '/' . $fse_plugin;
 		$invalid_fse_version_active =
-			is_plugin_active( 'full-site-editing/full-site-editing-plugin.php' ) &&
-			version_compare( get_plugin_data( WP_PLUGIN_DIR . '/full-site-editing/full-site-editing-plugin.php', false )['Version'], '3.56084', '<' );
+			file_exists( $fse_plugin_path ) &&
+			is_file( $fse_plugin_path ) &&
+			is_plugin_active( $fse_plugin ) &&
+			version_compare( get_plugin_data( $fse_plugin_path, false )['Version'], '3.56084', '<' );
 
 		if ( $invalid_fse_version_active ) {
 			return;