Horizontally scrolling in a DataTable with a left frozen column hide the vertical border of the frozen column

Describe the bug

When you have a frozen column at the left in the DataTable and you scroll horizontally then you see that the vertical border of the frozen column is not visible anymore.

Reproducer

https://stackblitz.com/edit/kss27vxm?file=src%2FApp.jsx

System Information

System:
    OS: Linux 5.0 undefined
    CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  Binaries:
    Node: 20.19.1 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 10.8.2 - /usr/local/bin/npm
    pnpm: 8.15.6 - /usr/local/bin/pnpm
  npmPackages:
    primereact: 10.9.6 => 10.9.6 
    react: 18.3.1 => 18.3.1

Steps to reproduce the behavior

1. start the reproduction

2. scroll horizontally some pixels

3. you see that the vertically border of the first frozen column is gone

Expected behavior

The vertically border should always be visible when scrolling.

(It should be even better to emphasize the border between the frozen column and not a frozen column)

Start with the supplied StackBlitz reproducer in src/App.jsx and confirm the frozen-column border disappears after horizontal scrolling. Trace the DataTable styling used by that example, then verify that the left frozen column's vertical border remains visible and distinct after scrolling.