Content in Gutenberg post is not translated

If the content of a Gutenberg custom post is not translated, while the title is translated, then most likely you have a Page Builder installed on your site (Elementor, Bricks, etc) and that CPT is assigned to the Page Builder.

If that's the case, and that CPT should be handled by Gutenberg, then remove that CPT from the Page Builder's settings.

Otherwise, go to the Gato AI Translations Settings page for the Page Builder, and make sure the option to translate the post_content field is enabled.