"Upload your `stats.txt` file to start reflecting on your authorship." hangs

**Describe the bug**

Uploading my `stats.txt` on https://writewithharper.com/stats just hangs with no feedback.
Disabling both mBlock Origin and Ghostery on Chrome doesn't fix it. Disabling AdGuard on Safari doesn't fix it.

**Screenshots**

This is the error in the Chrome devtools with both blockers disabled:

And the equivalent for Safari:

**Platform**
Google Chrome and Safari on macOS Sequoia.

Reproduce the upload from https://writewithharper.com/stats in Chrome and Safari on macOS Sequoia with the reported blockers disabled. Start by reviewing the Chrome and Safari DevTools errors attached to the issue; done means stats.txt uploads successfully and the page provides feedback instead of hanging.

Written by the indexing model from the issue text.