As shown in the screencast below, when user visits a Section Translation URL with pre-selected page title (e.g. https://test.m.wikipedia.org/w/index.php?title=Special:ContentTranslation&page=Advent%20wreath&from=en&to=ar&sx=true), and then clicks on the close icon inside "Confirm translation" step, the page and section suggestions are not being filled inside the dashboard.
Additionally, the pre-selected suggestion is always shown inside the section suggestion list, even if the target page doesn't exist (and thus it belongs to the page suggestions).