Unreal 5.6 Preview window flickering

flickering
After updating Unreal to 5.6, when moving timeline in Niagara preview window is flickering. Does anyone know how to fix this?

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Unfortunately this is true for me as well. You may file a formal bug report, although given that if you allow it to play itself instead of dragging the timeline manually, it plays back without flicker (true for whatever playback speed or framerate), I wouldn’t have much hope in Epic to fix this anytime soon.