If I move a component from the TOP layer to the BOT layer, then silk/soldermask switch along, to the bottom as expected.
But the paste-mask, which was present when component was on toplayer, disappears.
It can no longer be seen, neither as top paste mask nor as bottom paste mask.
            
                        
            
                                    
              
                Firefox
                  93.0
                Ubuntu
                  
                                EasyEDA
                  6.4.25