WordPress version: 5.9 (also tried downgrading to version 5.8 and 5.7 with no change)
Theme: Envision (also tried twenty twenty-two)
Plugins: tried disabling all plugins, issue persisted

I have a simple static site that I am now no longer able to edit any pages as the editor is blank. Where as before I could see my current and select from a wide arrange of widgets (blog, html block, paragraph, etc.) I no longer see these options. Instead on the page editor there are no widgets and it is essentially blank even though there is content on my webpage (i.e. pictures, text, etc.).

The plugin I was using to keep the widgets in the visual editor is Classic Editor.

An image of what a page editor for a page of my site looks like now is below: