HttpClient.get retrieving index.html instead of an asset file

When I run the code below locally it works fine. When it is pushed to server (AWS Amplify) it fails to work correctly.

In the console there is an error:

ERROR Error: Invalid HTML: could not find <table>
​

Code:

this.http
.get("./assets/data/test.txt", { responseType: "text" })
.subscribe((data) => {
console.log(data);
});


When run locally the output is whatever text is inside the file. When run from the server the output is the HTML of the Angular app.

I tried different file names and response types before discovering that the HTML was being returned.

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