only forward 4 most recent cached SPs (#16879)

Author: wjblanke

chia/full_node/full_node_store.py

@@ -830,7 +830,8 @@ def new_peak(
             if eos_op is not None:
                 self.recent_eos.put(eos_op.challenge_chain.get_hash(), (eos_op, time.time()))
 
-        return FullNodeStorePeakResult(new_eos, new_sps, new_ips)
+        # Only forward the last 4 SPs that we have cached, as others will be too old
+        return FullNodeStorePeakResult(new_eos, sorted(new_sps)[-4:], new_ips)
 
     def get_finished_sub_slots(
         self,