for _, prefix := range compareKeys {
			if !stringsHasPrefixFold(k, prefix) {
				continue
			}
			found = true
			break
		}
		if found {
			compareMeta1[strings.ToLower(k)] = v
		}
	}

	compareMeta2 := make(map[string]string)
	for k, v := range oi2.Metadata {
		var found bool
		for _, prefix := range compareKeys {
			if !stringsHasPrefixFold(k, prefix) {
				continue
			}

		if err != nil {
			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
			return
		}

		for k, v := range srcInfo.UserDefined {
			if stringsHasPrefixFold(k, ReservedMetadataPrefixLower) {
				encMetadata[k] = v
			}
		}

		if err = rotateKey(ctx, oldKey, newKeyID, newKey, srcBucket, srcObject, encMetadata, kmsCtx); err != nil {