App proxy not working on store subdomain

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I wanted to get some help on an issue, which probably is a bug in Shopify's App proxy feature.
App proxy lets us define a proxy url on the stores. But it seems to be not working on stores which have subdomains

for eg. is a store that has us installed.

We define through app proxy that any url from /apps/pushowl to proxy to our servers.

So that is why works

But also has a subdomain running ->

Ideally,  app proxy should work here too. But notice what happens on this url ->

It gets redirected to i.e. the main domain.

Is there a way to have app proxy work correctly on subdomains?