OpenSearch XML file has a broken favicon

Problem description:
The OpenSearch XML file ( links to an old favicon which now 404s:

Expected behavior:
It should link to the new prompt favicon:

Actual behavior:
It links to an old favicon which no longer exists and gives a 404 page.

Steps to reproduce:

Bug appears at this link:
OpenSearch.xml file is here:

Chrome 108.0.5359.124 (Official Build) (x86_64) on macOS.

I can replicate this issue.