fix

resources/assets/dcat-admin/main.css

@@ -834,7 +834,7 @@ input.label {
     letter-spacing: .05em;
 }
 .table-header-default.table>thead>tr>th {
-    border-bottom: 2px solid #f4f4f4;
+    border-bottom: 1px solid #f4f4f4;
 }
 .table>thead:first-child>tr:first-child>th:first-child {
     padding-left: 18px;

src/Form/Field/Tags.php

@@ -4,6 +4,7 @@ namespace Dcat\Admin\Form\Field;
 
 use Dcat\Admin\Admin;
 use Dcat\Admin\Form\Field;
+use Dcat\Admin\Support\Helper;
 use Illuminate\Contracts\Support\Arrayable;
 use Illuminate\Support\Arr;
 use Illuminate\Support\Collection;
@@ -46,11 +47,7 @@ class Tags extends Field
             $value = array_column($value, $this->visibleColumn, $this->key);
         }
 
-        if (is_string($value)) {
-            $value = explode(',', $value);
-        }
-
-        return array_filter((array) $value, 'strlen');
+        return array_filter(Helper::array($value), 'strlen');
     }
 
     /**

src/Form/Field/Tree.php

@@ -109,11 +109,11 @@ class Tree extends Field
 
     protected function formatNodes()
     {
-        $value = old($this->column, $this->value ?: $this->getDefault());
-        if ($value && !is_array($value)) {
-            $value = explode(',', $value);
-        }
-        $this->value = $value;
+        $value = Helper::array(
+            old($this->column, $this->value ?: $this->getDefault())
+        );
+
+        $this->value = &$value;
 
         if (!$this->nodes) return;