In \Drupal\Core\Utility\UnroutedUrlAssembler::buildExternalUrl() we rebuild external URLs from their parts unnecessarily. PHP has lots of PHPism in the way it processes URLs but external systems don't all run PHP so we should not futz with external URLs unless we have to.
See 🐛 Rewrite as URL adding equals sign to end of url. Needs work and 🐛 Url only outputs the last value of a query parameter Needs work
Take #3038774-31: Url only outputs the last value of a query parameter → and implement it.
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