Hello Sylvain,
I am not observing such problem on different projects. Can you share the screenshot of Metashape window?
Also make sure that tie point cloud is not empty - you see non zero number for the tie points in the contents of the active chunk in the Workspace pane; any Tie Points display mode is active in the Model view (Show Tie Points button is pressed); no filters are applied in Tools Menu -> Tie Points section.