Started in 4.3.0, manually updated to 4.3.1, issue not resolved
Exception Caught
Cannot add tree node to itself.
ee/legacy/libraries/datastructures/Tree.php:243
Stack Trace: Please include when reporting this error
#0 ee/legacy/libraries/datastructures/Tree.php(122): EE_TreeNode->add(Object(EE_TreeNode))
#1 ee/legacy/libraries/datastructures/Tree.php(54): EE_Tree->_build_tree(Object(EllisLab\ExpressionEngine\Service\Model\Collection), Array)
#2 ee/EllisLab/ExpressionEngine/Model/Category/CategoryGroup.php(121): EE_Tree->from_list(Object(EllisLab\ExpressionEngine\Service\Model\Collection), Array)
#3 ee/EllisLab/ExpressionEngine/Controller/Categories/Categories.php(77): EllisLab\ExpressionEngine\Model\Category\CategoryGroup->getCategoryTree(Object(EE_Tree))
#4 [internal function]: EllisLab\ExpressionEngine\Controller\Categories\Categories->group('1')
#5 ee/EllisLab/ExpressionEngine/Core/Core.php(240): call_user_func_array(Array, Array)
#6 ee/EllisLab/ExpressionEngine/Core/Core.php(109): EllisLab\ExpressionEngine\Core\Core->runController(Array)
#7 ee/EllisLab/ExpressionEngine/Boot/boot.php(146): EllisLab\ExpressionEngine\Core\Core->run(Object(EllisLab\ExpressionEngine\Core\Request))
#8 admin.php(147): require_once('...')
#8 admin.php(147): require_once('...')ExpressionEngine implements Markdown Extra and BBCode. Please see the Markdown Extra docs and the BBCode Wikipedia article for a full reference.
**bold**, __bold__, *italics*, _italics_, ~strike/del~, `code()`
bold, italics, strike/del, code()
Link: [link title](https://example.com)
Image: 
[blockquote]...[/blockquote], [quote]...[/quote], and Markdown style:
> Some quoted text. > > This is all one quote.
[code]...[/code], and you can also specify the language for syntax highlighting, [code=php]...[/code]
GitHub flavored Markdown code fences are also supported:
```
public function decoderRing($str)
{
return str_rot13($str);
}
```