The "link has expired" page is wrongly displayed when returning from the "Report Infringement" page to the download files page using the "Back" button

[SoftVision-CosminMuntean]

[Affected versions]:

• Chrome 84.0.4147.105
• Firefox Release 79;
• Firefox Beta 80.0b1;
• Nightly 81.0a1;
• Safari 13.1.2
• Microsoft Edge 84.0.522.48.

[Affected Platforms]:

• All Windows;
• All Linux
• All macOS;

• Have a download link that contains at least one file uploaded.

[Steps to reproduce]:

1. Open the Firefox browser and navigate to Send link from perquisites.
2. Click the "Report these files as suspicious" link.
3. Click the "this page" link displayed on the report page.
4. Click the browser's "Back" button.
5. Click the browser's "Back" button one more time.
6. Observe the loaded page.

[Expected result]:

• The Send download page is correctly loaded and the files can be downloaded.

[Actual result]:

• The "This link has expired." page is loaded.

[Notes]:

• If the "This link has expired." page is refreshed the download page is correctly loaded and the files can be downloaded.
• Attached a screen recording with the issue:
  

[SoftVision-CosminMuntean]

I have verified this issue and is no longer reproducible. The Send download page is correctly loaded and the files can be downloaded after following the provided steps.
Tested on Firefox 79.0 release, Firefox Beta 80.0b2, Nightly 81.0a1, Chrome 84.0.4147.105, Edge Chromium and Safari 13.1.2, on Windows 10 x64, Mac 10.14.6 and Ubuntu 20.04 x64.