richard9826

I found a solution

I installed the following plugin

https://wordpress.org/plugins/redirection/

I created a regular expression redirect

Source URL: /$slug-of-post-type/(.*)
Target URL: /$1

replace $slug-of-post-type with the slug of the post type e.g. if the post type slug is ‘products’

Source URL: /products/(.*)
Target URL: /$1