Refreshing keystatic admin UI results in a Not Found

[lee-orr]

This is a Keystatic setup with NextJS and GitHub.

When loading keystatic at the root /keystatic url, it loads fine - and I can navigate to any resource inside. However, if I referesh the view or navigate directly to a specific resource (for example, a contact page in a "pages" collection /keystatic/branch/main/collection/pages/item/contact) it adds a / to the end of the URL (/keystatic/branch/main/collection/pages/item/contact/) and show the "Not found" page.

I've tried making adjustments on my end - but nothing I do seems to resolve the issue. Any ideas for workarounds or more permanent solutions??