Private Relay and locally hosted server

Enabling Private Relay seems to block XHR in Safari from reaching a local HTTPS server hosted by an iOS app, though it works in other browsers.

Before (working): JS → https://local.example.com → 127.0.0.1 → OK

After (blocked / no DNS reply probably): JS → https://local.example.com → ERR

Is there any way to restore local domain access or mitigate this issue?

Private Relay and locally hosted server
 
 
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