Issue Summary

When the experiment tinymce_migration_convert_legacy_panels_to_fabric is enabled, legacy panel macros are forced into native ADF panel nodes during the storage-to-ADF conversion. This process drops all parameters outside of the standard FABRIC_SUPPORTED_PANEL_PARAMS (e.g., borderColor, titleColor, borderStyle). Consequently, restoring an older version that relies on these legacy parameters fails to recover the original layout, as the styling is stripped during the restoration's conversion phase.

Steps to Reproduce

1. Ensure the experiment tinymce_migration_convert_legacy_panels_to_fabric is enabled for the tenant.

1. Identify or create a page version that contains legacy panel macros with custom parameters (e.g., borderColor, titleBGColor).

1. Attempt to restore this version via Page History.

1. Observe the rendered result of the restored page.

Expected Results

The restored page should retain all original legacy panel styling, including custom borders, background colors, and title formatting.

Actual Results

The legacy panels are converted to native ADF panels, losing all custom styling. Titles are demoted to bold paragraphs, and parameters like borderColor or borderStyle are discarded.

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available