Xiaomi is already linked to 1 patent for a clamshell-type foldable. Now, however, there may be a newer version. This one shows a lengthy primary display that folds in half, as does the 2019 Motorola Razr. However, unlike this phone, it has a triple pop-up camera and a small screen on the back.
https://www.notebookcheck.net/Xiaomi-may-have-combined-a-foldable-form-factor-a-pop-up-camera-and-a-secondary-display-into-1-patent.447150.0.html