c.mux.Unlock()
		wasmCacheLookupCount.With(hitTag.Value(strconv.FormatBool(cacheHit))).Increment()
	}()

	if len(key.checksum) == 0 && strings.HasPrefix(key.downloadURL, ociURLPrefix) {
		if d, err := name.NewDigest(key.downloadURL[len(ociURLPrefix):]); err == nil {
			// If there is no checksum and the digest is suffixed in URL, use the digest.
			dstr := d.DigestStr()
			if strings.HasPrefix(dstr, sha256SchemePrefix) {