diff --git a/weed/wdclient/masterclient.go b/weed/wdclient/masterclient.go
index 62ced6daf..57523c8ec 100644
--- a/weed/wdclient/masterclient.go
+++ b/weed/wdclient/masterclient.go
@@ -2,6 +2,7 @@ package wdclient
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"math/rand"
 	"sort"
@@ -39,7 +40,7 @@ type MasterClient struct {
 	OnPeerUpdate     func(update *master_pb.ClusterNodeUpdate, startFrom time.Time)
 	OnPeerUpdateLock sync.RWMutex
 
-	// Per-volume-ID in-flight tracking to prevent duplicate lookups
+	// Per-batch in-flight tracking to prevent duplicate lookups for the same set of volumes
 	vidLookupGroup singleflight.Group
 }
 
@@ -108,7 +109,7 @@ func (mc *MasterClient) LookupFileIdWithFallback(ctx context.Context, fileId str
 }
 
 // LookupVolumeIdsWithFallback looks up volume locations, querying master if not in cache
-// Uses per-volume-ID singleflight to prevent duplicate lookups, with batched master queries
+// Uses singleflight to coalesce concurrent requests for the same batch of volumes
 func (mc *MasterClient) LookupVolumeIdsWithFallback(ctx context.Context, volumeIds []string) (map[string][]Location, error) {
 	result := make(map[string][]Location)
 	var needsLookup []string
@@ -227,16 +228,8 @@ func (mc *MasterClient) LookupVolumeIdsWithFallback(ctx context.Context, volumeI
 		}
 	}
 
-	// Return aggregated errors with clear formatting
-	if len(lookupErrors) > 0 {
-		errorMessages := make([]string, 0, len(lookupErrors))
-		for _, err := range lookupErrors {
-			errorMessages = append(errorMessages, err.Error())
-		}
-		return result, fmt.Errorf("lookup errors: %s", strings.Join(errorMessages, "; "))
-	}
-
-	return result, nil
+	// Return aggregated errors using errors.Join to preserve error types
+	return result, errors.Join(lookupErrors...)
 }
 
 func (mc *MasterClient) getCurrentMaster() pb.ServerAddress {