WordPress strikes again.
In WP-Admin, the ADD NEW button defaults to the Block Editor, but they added a dropdown. Drop the down arrow and select Classic Editor from the ADD NEW button.
Same goes for editing. Hover over the post you wish to edit and select CLASSIC Editor, to edit. Otherwise it will default to the Block Editor.
If you are having trouble liking posts in reader or getting notifications, try clearing your browser’s cache. Make sure you have all your passwords readily available, because by deleting cookies, you will be required to login to all your websites again.