Editing a dynamic link entity results in unexpected error

Problem/Motivation

Fresh install of Drupal 10.3.6, created a dynamic link with subrequests, without route, and trying to edit it will lead to

InvalidArgumentException: "0" is an invalid render array key. Value should be an array but got a string. in Drupal\Core\Render\Element::children() (line 97 of core/lib/Drupal/Core/Render/Element.php).