Steps: 1. Disable UnifiedPDF 2. Load a simple web page (e.g. smfr.org) 3. Via the url bar, load https://www.smcgov.org/media/72866/download?inline 4. Go Back 5. Go Forward The PDF fails to load; you just see the gray background.
<rdar://problem/121757735>
Pull request: https://github.com/WebKit/WebKit/pull/23369
Committed 273614@main (32f6aad73de0): <https://commits.webkit.org/273614@main> Reviewed commits have been landed. Closing PR #23369 and removing active labels.