Made undoing of mipmap bias a distinct separate callback, so that it can be overridden by client apps. Skip textures that don't have mipmaps and thus don't have any use for a mipmap bias.

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/SuperResolution.cs

@@ -240,9 +240,9 @@ namespace UnityEngine.Rendering.PostProcessing
             }
 
             // Undo the current mipmap bias offset
-            if (!float.IsNaN(_appliedBiasOffset) && !float.IsInfinity(_appliedBiasOffset) && _appliedBiasOffset != 0f)
+            if (_appliedBiasOffset != 0f && !float.IsNaN(_appliedBiasOffset) && !float.IsInfinity(_appliedBiasOffset))
             {
-                _callbacks.ApplyMipmapBias(-_appliedBiasOffset);
+                _callbacks.UndoMipmapBias(_appliedBiasOffset);
                 _appliedBiasOffset = 0f;
             }
         }

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/FSR2/Fsr2Callbacks.cs

@@ -42,6 +42,8 @@ namespace FidelityFX
         /// You may also want to store the bias offset value and apply it to any assets that are loaded in on demand.
         /// </summary>
         void ApplyMipmapBias(float biasOffset);
+
+        void UndoMipmapBias(float biasOffset);
     }
     
     /// <summary>
@@ -76,10 +78,23 @@ namespace FidelityFX
         {
             CurrentBiasOffset += biasOffset;
             
+            if (Mathf.Approximately(CurrentBiasOffset, 0f))
+            {
+                CurrentBiasOffset = 0f;
+            }
+
             foreach (var texture in Resources.FindObjectsOfTypeAll<Texture2D>())
             {
+                if (texture.mipmapCount <= 1)
+                    continue;
+                
                 texture.mipMapBias += biasOffset;
             }
         }
+
+        public virtual void UndoMipmapBias(float biasOffset)
+        {
+            ApplyMipmapBias(-biasOffset);
+        }
     }
 }