vanhaminator on "[Plugin: Post Type Switcher] changed posts to pages, when editing these pages hundreds more werde added"

I changed a number of (not yet published) posts to pages. I edited these new pages. Each time I publish one of the edited pages some 1500 completely empty pages (no title, no content, no url, nothing) are published at the same time.

https://wordpress.org/plugins/post-type-switcher/