Issue #3474641 by pdureau, grimreaper: LinksPropType: array to string conversion

src/Plugin/UiPatterns/PropType/LinksPropType.php

@@ -103,7 +103,12 @@ class LinksPropType extends PropTypePluginBase implements ContainerFactoryPlugin
       if (array_key_exists("text", $item)) {
         // Examples: links.html.twig, breadcrumb.html.twig, pager.html.twig,
         // views_mini_pager.html.twig.
-        $item["title"] = (string) $item["text"];
+        if (is_scalar($item["text"]) || $item["text"] instanceof \Stringable) {
+          $item["title"] = (string) $item["text"];
+        }
+        else {
+          $item["title"] = $item["text"];
+        }
         unset($item["text"]);
       }
       if (!array_key_exists("title", $item)) {