This function gets called for all sourcemap uploads, often then making a call to the release files endpoint to determine if the given sourcemaps have been uploaded. The problem is that this endpoint does not contain sourcemaps uploaded as artifact bundles, as those are stored separately.
Because of this, sourcemap uploads which use artifact bundles, the preferred modern method, call this endpoint unnecessarily, as the endpoint will return an empty list. This adds time to sourcemap uploads, with no benefit.