Add upstream

wp-content/plugins/jetpack/3rd-party/qtranslate-x.php

@@ -0,0 +1,19 @@
+<?php
+/**
+ * Prevent qTranslate X from redirecting REST calls.
+ *
+ * @since 5.3
+ *
+ * @param string $url_lang Language URL to redirect to.
+ * @param string $url_orig Original URL.
+ * @param array $url_info  Pieces of original URL.
+ *
+ * @return bool
+ */
+function jetpack_no_qtranslate_rest_url_redirect( $url_lang, $url_orig, $url_info ) {
+	if ( false !== strpos( $url_info['wp-path'], 'wp-json/jetpack' ) ) {
+		return false;
+	}
+	return $url_lang;
+}
+add_filter( 'qtranslate_language_detect_redirect', 'jetpack_no_qtranslate_rest_url_redirect', 10, 3 );