In the newly released Engine version 4.25.0 there seems to be a problem with screen space reflections (they only work correctly with Temporal AA).
I’ve also noticed this issue when I tested Physical Water Surface in UE 4.25.0: If FXAA is enabled then the SSR don’t look right. Everything else works fine in the new engine version. So please consider this if you plan to migrate your project to 4.25.0.
I’ll monitor the situation, hopefully there will be soon an update of the Engine that fixes this issue with SSR.