I suspect that I changed a Custom Type in Prismic which lead to pages that were of that custom type to have no content any longer. I cannot find a way to restore the old version of the custom type. Can anybody please help me by telling me how to reset this? Thank you so much in advance!
To view a list of changes to your document, click the "History" button at the top-right corner of the editor. Learn more about History in the Version Documents article.
There is no history for Custom Types, only for documents. Regardless which historical version of one document of type custom type I select it's always empty. This is why I was contacting you in the first place. I cannot see a history of the Custom Type and what we accidentally changed.
It's not possible to check the history of the Custom type. If you haven't published related documents and the master ref hasn't changed. You can check old API IDs in the API browser. But if you have published documents, the master ref has changed, and not possible to see the older version.