Context menu show bug!

Hi Epic team and all from Unreal Engine 4 community! I have few bugs into Unreal Engine 4 editor with version 4.8!
First bug this is double draw context sub menu if I press Add New button ( content browser ) and select Materials & Textures sub menu!

Second bug this is double draw and flash context menu if I call context menu from any assets into content browser or viewports and select Asset Actions!
I have like bugs into many other sub menus, but this bug very terrible for me! I hope, that Epic team fix this bugs very soon as possible! Thanks for your answer!