Featured Image Toolbar in Template Disappears

Using WP 2024 theme, I moved the featured image block from the content area of the “Pages” template to the default header because I like to have a different header image on each page, which I accomplish by enabling the featured image option in the page editor of each page. I noticed, however, that when I open the template in the site editor (either the “Pages” template or the default header “template part”) to style the featured image block, the ellipsis (the 3 dots) next to the highlighted block’s name and the toolbar are missing. I come back later and they reappear. Is this a bug?