JS Error with latest WordPress and Classic Editor

Hi there,

I just noticed a javascript error popping up in my admin after the update to the latest WordPress-Version when on a post.php or post-new.php screen for posts of type page or custom post types:

react-dom.js:24963 Uncaught Error: Target container is not a DOM element.
    at render (react-dom.js:24963)
    at t.renderClassicEditorMetabox (classic-editor-1570.js:1)
    at Object.t.default [as initEditorIntegration] (classic-editor-1570.js:1)
    at HTMLDocument.<anonymous> (post-edit-1570.js:1)

WP: 5.6
Classic Editor: 1.6