TOC using RD field not updating pages correctly

Up until two weeks ago, I had a Table of Contents (TOC) in Microsoft Word that linked to multiple external files, and it was working perfectly. The TOC updated both the heading levels and the page numbers correctly for each chapter. However, since then, I’ve encountered an issue where the TOC no longer shows the correct page numbers—it displays '1' for every heading instead of the actual page number.

For example (expected):

• Chapter name 1....1-1
  • Section 1....1-2
• Chapter name 2....2-1
  • Section 1....2-4
  • Section 2....2-5

For example (what is happening):

• Chapter name 1....1-1
  • Section 1....1-1
• Chapter name 2....2-1
  • Section 1....2-1
  • Section 2....2-1

The heading structure and formatting (e.g., Chapter 1, Chapter 2) are still updating as expected, but the page numbers are wrong. I’ve tried changing the page numbering formats (Arabic, Roman numerals, and letters) to see if that resolves it, but no luck—the page number always shows as '1.'

Oddly, when I generate a TOC within each individual file, the page numbers are accurate. But in the master document TOC linking to these files, the issue persists. I’ve also tested this with brand new Word files and even tried on a different computer, and the same problem occurs.

This setup was working fine two weeks ago with the exact same files, and I haven’t changed anything in the document structure. Has anyone experienced this or know a fix? Could there be a recent Word update or setting I’m missing that’s causing the TOC to misread the page numbers across multiple files?