Additionally added URL params leading to “Invalid post type.” in the Admin Panel

What you can do is copy live DB, and deploy it to dev. Once you do that, start to disabling plugins one by one to see which one causes an error. If it doesn’t help – check where else you have code injections ( theme or drop-in or must use plugins). If it doesn’t help you need to perform the same actions on live (which isn’t better solution). I would suggest to open (with js disabled page “/wp-admin/edit.php?post_type=page” and see what js file and code included – from which plugins, this will be a massive hint where to search next.)

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