Fixes rerender.

src/components/Grid/Cell.tsx

@@ -20,6 +20,7 @@ export const Cell = memo(
       rowHeight,
       rowStart,
       rowAutoHeight,
+      updateRowHeight,
     } = data;
 
     const currentRowIndex = rowIndex + rowStart;
@@ -58,16 +59,17 @@ export const Cell = memo(
     const cellRef = useRef<HTMLDivElement>(null);
 
     useEffect(() => {
-      if (cellRef.current && data.updateRowHeight) {
+      if (rowCount !== 1) return;
+      else if (cellRef.current) {
         const height = cellRef.current.getBoundingClientRect().height;
-        data.updateRowHeight(rowIndex, height);
+        updateRowHeight(rowIndex, height);
       }
-    });
+    }, [rowCount, updateRowHeight, rowIndex]);
 
     const styleWithHeight = {
       ...style,
-      height: "auto"
-    }
+      height: "auto",
+    };
 
     return (
       <div

src/components/Grid/Grid.tsx

@@ -225,15 +225,20 @@ export const Grid = forwardRef<HTMLDivElement, GridProps>(
       [rowHeight, rowAutoHeight]
     );
 
-    const updateRowHeight = useCallback((rowIndex: number, height: number) => {
-      const prevHeight = rowHeightsRef.current.get(rowIndex) ?? 0;
-      if (height > prevHeight) {
-        rowHeightsRef.current.set(rowIndex, height);
-        if (gridRef.current) {
-          gridRef.current.resetAfterRowIndex(rowIndex);
+    const updateRowHeight = useCallback(
+      (rowIndex: number, height: number) => {
+        if (rowCount !== 1) return;
+
+        const prevHeight = rowHeightsRef.current.get(rowIndex) ?? 0;
+        if (height > prevHeight) {
+          rowHeightsRef.current.set(rowIndex, height);
+          if (gridRef.current) {
+            gridRef.current.resetAfterRowIndex(rowIndex);
+          }
         }
-      }
-    }, []);
+      },
+      [rowCount]
+    );
 
     const customOnCopy: () => Promise<void> = useMemo(() => {
       const result = async () => {