Removed Xbox Series from the modern shaders, as it doesn't like Native16Bit at all and just falls back to legacy, and restored Native16Bit to all the modern shaders. Xbox Series will still use DXC and wave operations.

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/Upscaling/ASR/Runtime/AsrAssets.cs

@@ -70,7 +70,6 @@ namespace ArmASR
                 case GraphicsDeviceType.Metal:
                 case GraphicsDeviceType.PlayStation5:
                 case GraphicsDeviceType.PlayStation5NGGC:
-                case GraphicsDeviceType.GameCoreXboxSeries:
                     return modernShaders;
                 default:
                     return legacyShaders;

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/Upscaling/ASR/Shaders/ffxm_fsr2_fragment_modern.shader

@@ -12,7 +12,7 @@ Shader "TND/ASR/ffxm_fsr2_fragment_modern"
             #pragma vertex VertMain
             #pragma fragment main
             #pragma target 4.5
-            #pragma only_renderers d3d11 vulkan metal ps5 xboxseries
+            #pragma only_renderers d3d11 vulkan metal ps5
             #pragma use_dxc
             #pragma require Native16Bit
             //#pragma enable_d3d11_debug_symbols
@@ -35,7 +35,7 @@ Shader "TND/ASR/ffxm_fsr2_fragment_modern"
             #pragma vertex VertMain
             #pragma fragment main
             #pragma target 4.5
-            #pragma only_renderers d3d11 vulkan metal ps5 xboxseries
+            #pragma only_renderers d3d11 vulkan metal ps5
             #pragma use_dxc
             #pragma require Native16Bit
             //#pragma enable_d3d11_debug_symbols
@@ -62,7 +62,7 @@ Shader "TND/ASR/ffxm_fsr2_fragment_modern"
             #pragma vertex VertMain
             #pragma fragment main
             #pragma target 4.5
-            #pragma only_renderers d3d11 vulkan metal ps5 xboxseries
+            #pragma only_renderers d3d11 vulkan metal ps5
             #pragma use_dxc
             #pragma require Native16Bit
             //#pragma enable_d3d11_debug_symbols
@@ -90,7 +90,7 @@ Shader "TND/ASR/ffxm_fsr2_fragment_modern"
             #pragma vertex VertMain
             #pragma fragment main
             #pragma target 4.5
-            #pragma only_renderers d3d11 vulkan metal ps5 xboxseries
+            #pragma only_renderers d3d11 vulkan metal ps5
             #pragma use_dxc
             #pragma require Native16Bit
             //#pragma enable_d3d11_debug_symbols
@@ -120,7 +120,7 @@ Shader "TND/ASR/ffxm_fsr2_fragment_modern"
             #pragma vertex VertMain
             #pragma fragment main
             #pragma target 4.5
-            #pragma only_renderers d3d11 vulkan metal ps5 xboxseries
+            #pragma only_renderers d3d11 vulkan metal ps5
             #pragma use_dxc
             #pragma require Native16Bit
             //#pragma enable_d3d11_debug_symbols

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/Upscaling/ASR/Shaders/ffxm_fsr2_lock_modern.compute

@@ -1,6 +1,7 @@
 #pragma kernel main
-#pragma only_renderers d3d11 vulkan metal ps5 xboxseries
+#pragma only_renderers d3d11 vulkan metal ps5
 #pragma use_dxc
+#pragma require Native16Bit
 //#pragma enable_d3d11_debug_symbols
 
 #pragma multi_compile __ FFXM_HALF

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/Upscaling/ASR/Shaders/ffxm_fsr2_luma_pyramid_legacy.compute

@@ -10,7 +10,13 @@
 
 #include "ffxm_fsr2_common.cginc"
 
-// Disable wave operations altogether
+// Enable wave operations for the platforms that support it
+#if defined(SHADER_API_GAMECORE_XBOXSERIES)
+#pragma require WaveBasic   // Required for WaveGetLaneIndex
+#pragma require WaveBallot  // Required for WaveReadLaneAt
+#pragma require QuadShuffle // Required for QuadReadAcross
+#else
 #define FFXM_SPD_NO_WAVE_OPERATIONS
+#endif
 
 #include "shaders/ffxm_fsr2_compute_luminance_pyramid_pass.hlsl"

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/Upscaling/ASR/Shaders/ffxm_fsr2_luma_pyramid_modern.compute

@@ -1,6 +1,7 @@
 #pragma kernel main
-#pragma only_renderers d3d11 vulkan metal ps5 xboxseries
+#pragma only_renderers d3d11 vulkan metal ps5
 #pragma use_dxc
+#pragma require Native16Bit
 //#pragma enable_d3d11_debug_symbols
 
 #pragma multi_compile __ FFXM_HALF
@@ -13,7 +14,7 @@
 #include "ffxm_fsr2_common.cginc"
 
 // Enable wave operations for the platforms that support it
-#if (defined(SHADER_API_D3D12) || defined(SHADER_API_VULKAN) || defined(SHADER_API_METAL) || defined(SHADER_API_GAMECORE)) && !defined(SHADER_API_MOBILE)
+#if (defined(SHADER_API_D3D12) || defined(SHADER_API_VULKAN) || defined(SHADER_API_METAL)) && !defined(SHADER_API_MOBILE)
 #pragma require WaveBasic   // Required for WaveGetLaneIndex
 #pragma require WaveBallot  // Required for WaveReadLaneAt
 #pragma require QuadShuffle // Required for QuadReadAcross