Postprocess outliner glitching

Development Rendering
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Hello!

I have followed this tutorial on how to create a postprocessing outline using Scene Depths and SceneTextures: UE4 | UE5 Tutorial : Outline Material (youtube.com)

But when applying the material to the PostProcessVolume, the outline starts glitching/vibrating. It seems to be a problem with the Temporal Anti-Aliasing because it works with FXAA and MSAA. Someone told me that the FXAA and MSAA isn’t realtime (which is needed for this project).

Could someone explain to me why it’s like that? and is there a workaround for using temporal anti-aliasing?

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Changing the Blendable Location to Before Tonemapping does the trick if you want the outliner to stop flickering. This means the the postprocess will have anti-aliasing applied:

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