I created posts with gallery setting, adding a gallery type and a tiled gallery for another one. It shows nicely on the blog article, but does not appear on the homepage, but it should load instead of the featured image. But no featured image and no gallery either on the homepage, just an empty space below.
Also it says in the PATCH support page:
The gallery post format is similar to standard posts, except that the featured image is replaced with the first gallery image found in the post content. Learn more about working with Galleries and Slideshows.”
But neither the first gallery image, neither the featured image appears :(