[CRITICAL SYSTEM BUG / DATA LOSS REPORT]
Product: Adobe Acrobat Desktop (Regular version, Continuous Release)
Category: Accessibility

Summary of Defect:
The "Combine Files" tool destroys existing accessibility metadata strings during the document serialization process. While the top-level structure tree appears to maintain a "Passed" status for a Tagged PDF, all underlying values assigned to figures and graphics are entirely stripped upon file save.

Steps to Reproduce:
1. Export multiple individual document chapters from Microsoft Word with active accessibility tags and verified Alternative Text attached to all images/figures.
2. Open Adobe Acrobat and use the "Combine Files" tool to merge the individual tagged chapter PDFs into a single, multi-page textbook (specifically testing a large 1,050-page document across 19 chapters).
3. Run the Acrobat Accessibility Checker on the newly combined file.
4. Expand the "Alternate Text" drop-down menu and open the automated "Fix" wizard or "Add Alt Text" dialogue.

Expected Result:
The combined PDF should seamlessly inherit and preserve all pre-existing alternative text metadata blocks bound to the original files' figure tags.

Observed/Actual Result:
The "Tagged PDF" rule passes, but the software completely wipes out the text contents under the hood, resulting in an unrecoverable global "Figures alternate text - Failed" status error. The user is forced to manually re-type thousands of lines of alt text because the software silently dropped the attributes during the merge routine.