diff --git a/packages/react-table/package.json b/packages/react-table/package.json
index dc1aecfc8e..a34a2e1af6 100644
--- a/packages/react-table/package.json
+++ b/packages/react-table/package.json
@@ -63,8 +63,7 @@
     "build": "tsdown"
   },
   "dependencies": {
-    "@tanstack/react-store": "^0.11.0",
-    "@tanstack/table-core": "workspace:*"
+    "@tanstack/react-store": "^0.11.0"
   },
   "devDependencies": {
     "@eslint-react/eslint-plugin": "^5.8.16",
@@ -75,6 +74,7 @@
     "react": "^19.2.7"
   },
   "peerDependencies": {
+    "@tanstack/table-core": "workspace:*",
     "react": ">=18"
   }
 }
diff --git a/packages/table-core/src/core/columns/constructColumn.ts b/packages/table-core/src/core/columns/constructColumn.ts
index b6ca11debf..82baee88cf 100644
--- a/packages/table-core/src/core/columns/constructColumn.ts
+++ b/packages/table-core/src/core/columns/constructColumn.ts
@@ -115,5 +115,11 @@ export function constructColumn<
   column.id = `${String(id)}`
   column.parent = parent
 
+  // Initialize instance-specific data (e.g., caches) for features that need it
+  const features = Object.values(table._features)
+  for (let i = 0; i < features.length; i++) {
+    features[i]!.initColumnInstanceData?.(column)
+  }
+
   return column as Column<TFeatures, TData, TValue>
 }
diff --git a/packages/table-core/src/features/column-grouping/columnGroupingFeature.types.ts b/packages/table-core/src/features/column-grouping/columnGroupingFeature.types.ts
index c376f378fa..a39daad78f 100644
--- a/packages/table-core/src/features/column-grouping/columnGroupingFeature.types.ts
+++ b/packages/table-core/src/features/column-grouping/columnGroupingFeature.types.ts
@@ -89,7 +89,7 @@ export interface ColumnDef_ColumnGrouping<
   /**
    * Specify a value to be used for grouping rows on this column. If this option is not specified, the value derived from `accessorKey` / `accessorFn` will be used instead.
    */
-  getGroupingValue?: (row: TData) => any
+  getGroupingValue?: (row: TData, index: number) => any
 }
 
 export interface Column_ColumnGrouping<
diff --git a/packages/table-core/src/features/column-grouping/columnGroupingFeature.utils.ts b/packages/table-core/src/features/column-grouping/columnGroupingFeature.utils.ts
index 49c26083b3..b36aadbeec 100644
--- a/packages/table-core/src/features/column-grouping/columnGroupingFeature.utils.ts
+++ b/packages/table-core/src/features/column-grouping/columnGroupingFeature.utils.ts
@@ -284,6 +284,7 @@ export function row_getGroupingValue<
   if (row._groupingValuesCache) {
     row._groupingValuesCache[columnId] = column.columnDef.getGroupingValue(
       row.original,
+      row.index,
     )
   }