REST API error when using a custom site url

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Hi!
Your plugin works wonderfully in a “standard” wordpress environment. However, we’re creating a headless environment for which we need to set the Site Address (URL) (in Settings -> General) to something other than the WordPress Address.

The initial REST API /wp-json/instant-images/test/ call immediately fails, because it is falsely run on the headless (Site Address) domain, rather than the wp-admin (WordPress Address) domain.

I can’t find any reference to this. Please advise.