here is interesting hack, that can be fixed
All reflections flickers like crazy in 4.25 version, its a fact. Reflections issue stopped / been fixed in latest 4.26 version, but all my projects are set up in 4.25 and convertion would damage them. Now, if I run 4.26 in same time as my 4.25 projects, all flickers stops / goes away / fixed. Once I leave 4.26 and keep 4.25 opened, flicker is back… wth.
BTW, you dont have to even close 4.26 to get flickering back, you can just open project settings in 4.25 and flickering is back even 4.26 is opened. That brought me an idea, solution below.
TemporalAA jitter doesnt fix anything.
HOW TO FIX IT?
go to Project Settings / Rendering /, and change Anti-Aliasing Method to TemporalAA
That will fix it. (Default is FXAA, broken)