Way point display bug at QGC 4.X latest version

Yestorday, I got the latest version from the download website. But when I made the misson plan , clicked the waypoint icon ,the points on the map disappeared。I’m puzzled by the bug. A few minutes later,I have got the QGC of Version 3.X ,I try to Repeat the operations, it‘s OK on version 3.X。I save
the way points by files and upload to the latest QGC daily ,it do can appear again.