Unwanted 302 redirect to a different domain upon a request with query string

What is the name of the domain?

mer.re, fadmin.saddalim.hu

What is the error number?

302

What is the issue you’re encountering

I have two domains managed by CF, one of which has a subdomain that has SSL enforcement (fadmin.saddalim.hu, strict page rule). On the first domain (mer.re), an URL to a .js file yields a 302 redirect to the second (sub)domain if appended by a query string (FAdmin), but not when it is referenced without (https://mer.re/js/utils.js). This is a new issue that wasn’t happening before - server configuration did not change. Why is this happening, and how can a redirect be issued to another domain?

What steps have you taken to resolve the issue?

Purged cache (first selectively, then the entire cache), didn’t work
Switching on development mode (temporarily) solves the issue, and the GET with ?v=4 is also served correctly.
CF Trace fails with: ‘error processing request: can not collect zone trace’

What are the steps to reproduce the issue?

curl -i FAdmin

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