there is a bug when you try sticky pin column group

TanStack Table version

8.13.2

Framework/Library version

18.2.0

Describe the bug and the steps to reproduce it

open https://tanstack.com/table/v8/docs/framework/react/examples/column-pinning-sticky example and group firstname and lastname

const columnHelper = createColumnHelper<Person>();

const defaultColumns: ColumnDef<Person>[] = [
  columnHelper.group({
    id: 'info',
    header: () => <span>Info</span>,
    columns: [
      {
        accessorKey: 'firstName',
        id: 'firstName',
        header: 'First Name',
        cell: (info) => info.getValue(),
        footer: (props) => props.column.id,
        size: 180,
      },
      {
        accessorFn: (row) => row.lastName,
        id: 'lastName',
        cell: (info) => info.getValue(),
        header: () => <span>Last Name</span>,
        footer: (props) => props.column.id,
        size: 180,
      },
    ],
  }),
  {
    accessorKey: 'age',
    id: 'age',
    header: 'Age',
    footer: (props) => props.column.id,
    size: 180,
  },
  {
    accessorKey: 'visits',
    id: 'visits',
    header: 'Visits',
    footer: (props) => props.column.id,
    size: 180,
  },
  {
    accessorKey: 'status',
    id: 'status',
    header: 'Status',
    footer: (props) => props.column.id,
    size: 180,
  },
  {
    accessorKey: 'progress',
    id: 'progress',
    header: 'Profile Progress',
    footer: (props) => props.column.id,
    size: 180,
  },
];

then try pin "info" group info to the left (or right).

Your Minimal, Reproducible Example - (Sandbox Highly Recommended)

https://stackblitz.com/edit/tanstack-table-n7umup?file=src%2Fmain.tsx

Screenshots or Videos (Optional)

Do you intend to try to help solve this bug with your own PR?

None

Terms & Code of Conduct

• I agree to follow this project's Code of Conduct
• I understand that if my bug cannot be reliable reproduced in a debuggable environment, it will probably not be fixed and this issue may even be closed.

Start with the linked StackBlitz reproduction and the column-pinning-sticky React example. Group the firstName and lastName columns as shown, pin the info group left and right, and compare the sticky behavior with ungrouped columns; done means grouped-column pinning behaves correctly in both directions.