Clear eval cache for selectFirst directly after execution

Related to jhy#2411

Author: jhy

src/main/java/org/jsoup/select/Collector.java

@@ -73,7 +73,9 @@ public static <T extends Node> Stream<T> streamNodes(Evaluator evaluator, Elemen
      @return the first match; {@code null} if none
      */
     public static @Nullable Element findFirst(Evaluator eval, Element root) {
-        return stream(eval, root).findFirst().orElse(null);
+        Element el = stream(eval, root).findFirst().orElse(null);
+        eval.reset();
+        return el;
     }
 
     /**
@@ -87,7 +89,9 @@ public static <T extends Node> Stream<T> streamNodes(Evaluator evaluator, Elemen
      @since 1.21.1
      */
     public static <T extends Node> @Nullable T findFirstNode(Evaluator eval, Element root, Class<T> type) {
-        return streamNodes(eval, root, type).findFirst().orElse(null);
+        T node = streamNodes(eval, root, type).findFirst().orElse(null);
+        eval.reset();
+        return node;
     }
 
     /**