Fix payload attribute proposer calculation (#15228)

Process slots if epoch is greater than head state epoch

beacon-chain/rpc/eth/events/events.go

@@ -711,7 +711,7 @@ func (s *Server) fillEventData(ctx context.Context, ev payloadattribute.EventDat
 			return ev, errors.Wrap(err, "could not get head state")
 		}
 		// double check that we need to process_slots, just in case we got here via a hot state cache miss.
-		if slots.ToEpoch(st.Slot()) == pse {
+		if slots.ToEpoch(st.Slot()) < pse {
 			start, err := slots.EpochStart(pse)
 			if err != nil {
 				return ev, errors.Wrap(err, "invalid state slot; could not compute epoch start")

changelog/tt_ramen.md

@@ -0,0 +1,3 @@
+### Fixed
+
+- Process slots across epoch for payload attribute event.