404 on all Category pages.

Have upgraded from 1.8.1.0 to 2.3.3.

But every single category page is now 404’d.

Have truncated a url_rewrite and catalog_url_rewrite_product_category, but no luck.

Have gotten rid of the other root and clear:cached and reindexed.

Other symptoms: All of the form fields in the categories are blank.

Would very much appreciate any help, thank you!