UE 5.5 Impostor not baking AO

Development Pipeline & Plugins Plugins
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Hi everyone,
in UE version 5.5.3, I managed to get the impostor baker working thanks to this thread but when I bake it, the AO channel is completely white even if the buffer shows some info.

Did someone find a solution?

UnrealEditor_51ky3HUjop
UnrealEditor_51ky3HUjop1920×1047 68.8 KB

UnrealEditor_in3gLLOoxR
UnrealEditor_in3gLLOoxR1274×1286 142 KB