Return early blob constructor if not deneb (#14605)

* Return early blob constructor if not deneb

* Update CHANGELOG.md

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

* Remove test

* Remove space

---------

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

CHANGELOG.md

@@ -47,6 +47,7 @@ The format is based on Keep a Changelog, and this project adheres to Semantic Ve
 - Only Build the Protobuf state once during serialization.
 - Capella blocks are execution.
 - Fixed panic when http request to subscribe to event stream fails.
+- Return early for blob reconstructor during capella fork
 
 ### Deprecated
 

beacon-chain/sync/subscriber_beacon_blocks.go

@@ -12,6 +12,7 @@ import (
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/blocks"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/interfaces"
 	"github.com/prysmaticlabs/prysm/v5/io/file"
+	"github.com/prysmaticlabs/prysm/v5/runtime/version"
 	"github.com/prysmaticlabs/prysm/v5/time/slots"
 	"google.golang.org/protobuf/proto"
 )
@@ -62,6 +63,10 @@ func (s *Service) beaconBlockSubscriber(ctx context.Context, msg proto.Message)
 // This function reconstructs the blob sidecars from the EL using the block's KZG commitments,
 // broadcasts the reconstructed blobs over P2P, and saves them into the blob storage.
 func (s *Service) reconstructAndBroadcastBlobs(ctx context.Context, block interfaces.ReadOnlySignedBeaconBlock) {
+	if block.Version() < version.Deneb {
+		return
+	}
+
 	startTime, err := slots.ToTime(uint64(s.cfg.chain.GenesisTime().Unix()), block.Block().Slot())
 	if err != nil {
 		log.WithError(err).Error("Failed to convert slot to time")