With “Block lab” installed, “Parent page” dropdown from “Page Options” disappears. If Block Lab is deactivated, I can choose a parent page.

There is a javascript error in the (Gutenberg) editor:

Unhandled promise rejection
Response { type: "basic", url: "https://test.local/wp-json/wp/v2/pages?per_page=100&exclude=577&parent_exclude=577&orderby=menu_order&order=asc&context=edit&_locale=user", redirected: false, status: 500, ok: false, statusText: "Internal Server Error", headers: Headers, body: ReadableStream, bodyUsed: false }
wp-polyfill.min.js:2:31500

The json response is:

code	"rest_forbidden_context"
message	"Du har desværre ikke tilladelse til at redigere indlæg af denne indholdstype." //Unfortunately, you do not have permission to edit posts of this content type.
data
  status	401

Are there some permissions I need to set?

Thanks!