UE 4.26 Reflection Flicker issue

Whenever a level sequence is triggered, there is a flicker in the reflections, how to eliminate this,

Scene has raytracing on for reflections and AO alone, not for GI,
tried without raytracing, still the flicker is there but a little different as it is from screenspace reflections.

GPU - RTX 2070 Super, tried on other computers, even on rtx 3080, still the same

The only thing that helped it little is screen percentage set to 150%, but what is the proper solution for this?