For anyone debugging, the error I get is:
TypeError: this.activateMode is not a function
at https://xxxxxxxxxxx.xxx/wp-includes/js/media-views.min.js?ver=fb47caae6d4ea22b4b7dafad56ff8cb0:2:59604
at kt (https://xxxxxxxxxxx.xxx/wp-content/plugins/simple-sitemap/lib/block_assets/js/blocks.editor.js?ver=1708276514:2:5765)
at Function.ga (https://xxxxxxxxxxx.xxx/wp-content/plugins/simple-sitemap/lib/block_assets/js/blocks.editor.js?ver=1708276514:2:40572)
at n._createModes (https://xxxxxxxxxxx.xxx/wp-includes/js/media-views.min.js?ver=fb47caae6d4ea22b4b7dafad56ff8cb0:2:59564)
at n.initialize (https://xxxxxxxxxxx.xxx/wp-includes/js/media-views.min.js?ver=fb47caae6d4ea22b4b7dafad56ff8cb0:2:58973)
at n.initialize (https://xxxxxxxxxxx.xxx/wp-includes/js/media-views.min.js?ver=fb47caae6d4ea22b4b7dafad56ff8cb0:2:79857)
at n.initialize (https://xxxxxxxxxxx.xxx/wp-includes/js/media-views.min.js?ver=fb47caae6d4ea22b4b7dafad56ff8cb0:2:73432)
at h.View (https://xxxxxxxxxxx.xxx/wp-includes/js/backbone.min.js?ver=1.5.0:2:14872)
at n.constructor (https://xxxxxxxxxxx.xxx/wp-includes/js/wp-backbone.min.js?ver=fb47caae6d4ea22b4b7dafad56ff8cb0:2:2602)
at n.constructor (https://xxxxxxxxxxx.xxx/wp-includes/js/media-views.min.js?ver=fb47caae6d4ea22b4b7dafad56ff8cb0:2:106817)
It only seems to occur on posts with a featured image, or at least thats all that seems to happen on my test setup. Or create a new post and editor loads fine, click to add a featured image and it crashes. Disable this plugin, or go back to the previous version and all is fine. Using WordPress 6.4.3, and plugin version 3.5.11 with PHP 8.1.