Reflection Flickering Issue in Unreal 5.4.4 on Mac M1 – Bug or Settings Issue?

Development Rendering
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I’m experiencing severe flickering in reflections after updating to Unreal 5.4.4. I’ve attached two videos: one from Unreal 5.4.4 showing heavy flickering in reflections, and another from Unreal 5.2.1 where the same scene appears flicker-free. As far as I can tell, the main settings are identical in both versions.

Here is the videos: Reflections issues - Frame.io

Is anyone else experiencing this? Could this be a bug in Unreal 5.4.4? I’m running Unreal on a Mac with an M1 chip, so I wonder if it might be specific to this hardware.

Thanks in advance for any insights or suggestions!

Regards,
Tor Martin

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Greetings @Tor_Martin_N

Welcome back to the Unreal Forums! I’ve saw something similar to this before. Are you running DX11 or 12? If you’re on 11, try swapping to 12, enabling hardware ray tracing and tell Lumen to use ray tracing. Then set UE to use ray tracing instead of Lumen. (Sorry if the wording sounds confusing)

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Hei @FrostyJas ,
I am using a Mac, so there is no DX11 for me…

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Oh, I see! Did you try the ray tracing instead of lumen?