Hi @lucas.fermino,
We haven't had any reports from other users that previews aren't working as they should, and nothing on our end looks out of the ordinary - would it be possible to get a little more information on your set-up to help you troubleshoot this? A Jam recording would be helpful, as it'll capture the browser console and let us know if anything looks out of place. Could you also share how your previews are set up in your code?
For the testing you're doing, a full cookie ref should look something like this:
https://prismic-academy.prismic.io/previews/ZafJyRIAACQAmCLi:Z_zscBEAACAAW_X4?websitePreviewId=ZS6vrxEAACEARkFl%22
So for example, you'd want it to be:
https://prismic-academy.prismic.io/api/v2/documents/search?ref=https://prismic-academy.prismic.io/previews/ZafJyRIAACQAmCLi:Z_zscBEAACAAW_X4?websitePreviewId=ZS6vrxEAACEARkFl&src=apibrowser#format=json
Instead of:
https://prismic-academy.prismic.io/api/v2/documents/search?ref=Z_zrzBEAAJokW_Tu~ZS6vrxEAACEARkFl&src=apibrowser#format=json
Let me know if that helps, and I'd also recommend checking out our Troubleshooting: Content Previews guide for additional debugging 