Child has a missing parent after multiple reconnect

```
2025-11-28 16:45:18.981 3253 INFO RECONNECT <> ReconnectController: A state was obtained from a peer
2025-11-28 16:45:18.986 3254 INFO RECONNECT <> ReconnectController: The state obtained from a peer was validated
2025-11-28 16:45:19.188 3256 INFO STATE_TO_DISK <> DefaultSavedStateController: Signed state from round 534765 created, will eventually be written to disk, for reason: RECONNECT
2025-11-28 16:45:19.189 3258 INFO PLATFORM_STATUS StatusStateMachine: Platform spent 17.2 m in BEHIND. Now in RECONNECT_COMPLETE {"oldStatus":"BEHIND","newStatus":"RECONNECT_COMPLETE"} [com.swirlds.logging.legacy.payload.PlatformStatusPayload]
2025-11-28 16:45:19.189 3259 INFO STARTUP Shadowgraph: Shadowgraph starting from expiration threshold 534738
2025-11-28 16:45:19.193 3261 INFO STATE_TO_DISK <> SignedStateFileWriter: Started writing round 534765 state to disk. Reason: RECONNECT, directory: /opt/hgcapp/services-hedera/HapiApp2.0/data/saved/com.hedera.services.ServicesMain/27/123/534765
2025-11-28 16:45:19.194 3262 INFO STATE_TO_DISK <> MerkleTreeSnapshotWriter: Creating a snapshot on demand in /opt/hgcapp/services-hedera/HapiApp2.0/data/saved/swirlds-tmp/3 for round 534765
2025-11-28 16:45:19.200 3263 INFO STARTUP PcesFileManager: Due to recent operations on this node, the local preconsensus event stream will have a discontinuity. The last file with the old origin round is 2025-11-28T14+39+36.660229756Z_seq31192_minr528231_maxr528260_orgn491721.pces. All future files will have an origin round of 534765.
2025-11-28 16:45:19.202 3264 INFO RECONNECT <> ReconnectController: Reconnect almost done resuming gossip
2025-11-28 16:45:19.220 3268 INFO RECONNECT <> RpcPeerHandler: SELF_FALLEN_BEHIND local ev=EventWindow[latestConsensusRound=534765,ancientThreshold=534738,expiredThreshold=534738] remote ev=EventWindow[latestConsensusRound=535764,ancientThreshold=535737,expiredThreshold=534763]
2025-11-28 16:45:20.153 3271 INFO RECONNECT <> RpcPeerHandler: SELF_FALLEN_BEHIND local ev=EventWindow[latestConsensusRound=534765,ancientThreshold=534738,expiredThreshold=534738] remote ev=EventWindow[latestConsensusRound=535764,ancientThreshold=535737,expiredThreshold=534763]
2025-11-28 16:45:21.011 3272 INFO RECONNECT <> RpcPeerHandler: SELF_FALLEN_BEHIND local ev=EventWindow[latestConsensusRound=534765,ancientThreshold=534738,expiredThreshold=534738] remote ev=EventWindow[latestConsensusRound=535765,ancientThreshold=535738,expiredThreshold=534764]
2025-11-28 16:45:21.275 3273 INFO RECONNECT <> RpcPeerHandler: SELF_FALLEN_BEHIND local ev=EventWindow[latestConsensusRound=534765,ancientThreshold=534738,expiredThreshold=534738] remote ev=EventWindow[latestConsensusRound=535765,ancientThreshold=535738,expiredThreshold=534764]
2025-11-28 16:45:21.989 3274 INFO RECONNECT <> RpcPeerHandler: SELF_FALLEN_BEHIND local ev=EventWindow[latestConsensusRound=534765,ancientThreshold=534738,expiredThreshold=534738] remote ev=EventWindow[latestConsensusRound=535766,ancientThreshold=535739,expiredThreshold=534765]
2025-11-28 16:45:22.211 3275 INFO RECONNECT <> RpcPeerHandler: SELF_FALLEN_BEHIND local ev=EventWindow[latestConsensusRound=534765,ancientThreshold=534738,expiredThreshold=534738] remote ev=EventWindow[latestConsensusRound=535766,ancientThreshold=535739,expiredThreshold=534765]
2025-11-28 16:45:23.141 3276 INFO RECONNECT <> RpcPeerHandler: SELF_FALLEN_BEHIND local ev=EventWindow[latestConsensusRound=534765,ancientThreshold=534738,expiredThreshold=534738] remote ev=EventWindow[latestConsensusRound=535766,ancientThreshold=535739,expiredThreshold=534765]
2025-11-28 16:45:23.281 3277 INFO RECONNECT <> RpcPeerHandler: SELF_FALLEN_BEHIND local ev=EventWindow[latestConsensusRound=534765,ancientThreshold=534738,expiredThreshold=534738] remote ev=EventWindow[latestConsensusRound=535766,ancientThreshold=535739,expiredThreshold=534765]
2025-11-28 16:45:23.817 3278 INFO RECONNECT <> RpcPeerHandler: SELF_FALLEN_BEHIND local ev=EventWindow[latestConsensusRound=534765,ancientThreshold=534738,expiredThreshold=534738] remote ev=EventWindow[latestConsensusRound=535766,ancientThreshold=535739,expiredThreshold=534765]
2025-11-28 16:45:24.201 3279 INFO RECONNECT <> RpcPeerHandler: SELF_FALLEN_BEHIND local ev=EventWindow[latestConsensusRound=534765,ancientThreshold=534738,expiredThreshold=534738] remote ev=EventWindow[latestConsensusRound=535766,ancientThreshold=535739,expiredThreshold=534765]
2025-11-28 16:45:24.664 3280 INFO RECONNECT <> RpcPeerHandler: SELF_FALLEN_BEHIND local ev=EventWindow[latestConsensusRound=534765,ancientThreshold=534738,expiredThreshold=534738] remote ev=EventWindow[latestConsensusRound=535767,ancientThreshold=535740,expiredThreshold=534766]
2025-11-28 16:45:24.769 3281 INFO RECONNECT <> RpcPeerHandler: SELF_FALLEN_BEHIND local ev=EventWindow[latestConsensusRound=534765,ancientThreshold=534738,expiredThreshold=534738] remote ev=EventWindow[latestConsensusRound=535767,ancientThreshold=535740,expiredThreshold=534766]
2025-11-28 16:45:25.089 3282 INFO RECONNECT <> RpcPeerHandler: SELF_FALLEN_BEHIND local ev=EventWindow[latestConsensusRound=534765,ancientThreshold=534738,expiredThreshold=534738] remote ev=EventWindow[latestConsensusRound=535767,ancientThreshold=535740,expiredThreshold=534766]
2025-11-28 16:45:25.785 3283 INFO RECONNECT <> RpcPeerHandler: SELF_FALLEN_BEHIND local ev=EventWindow[latestConsensusRound=534765,ancientThreshold=534738,expiredThreshold=534738] remote ev=EventWindow[latestConsensusRound=535769,ancientThreshold=535742,expiredThreshold=534768]
2025-11-28 16:45:26.246 3284 INFO RECONNECT <> ReconnectController: Preparing for reconnect, stopping gossip
2025-11-28 16:45:26.246 3285 INFO RECONNECT <> RpcPeerHandler: SELF_FALLEN_BEHIND local ev=EventWindow[latestConsensusRound=534765,ancientThreshold=534738,expiredThreshold=534738] remote ev=EventWindow[latestConsensusRound=535769,ancientThreshold=535742,expiredThreshold=534768]
2025-11-28 16:45:26.246 3286 INFO RECONNECT <> ReconnectController: Preparing for reconnect, start clearing queues
2025-11-28 16:45:26.246 3287 INFO PLATFORM_STATUS StatusStateMachine: Platform spent 7.1 s in RECONNECT_COMPLETE. Now in BEHIND {"oldStatus":"RECONNECT_COMPLETE","newStatus":"BEHIND"} [com.swirlds.logging.legacy.payload.PlatformStatusPayload]
2025-11-28 16:45:26.407 3288 INFO RECONNECT <> ReconnectController: Queues have been cleared
2025-11-28 16:45:26.407 3289 INFO RECONNECT <> ReconnectController: Waiting for a state to be obtained from a peer
2025-11-28 16:45:26.412 3290 ERROR EXCEPTION <> LinkerLogsAndMetrics: Child has a missing parent. This should not be possible. Child: EventDescriptorWrapper[eventDescriptor=EventDescriptor[hash=f1c722ff34bd4be57d0148674f196e90c5111dc80c618a83c5b6bd1431378403bee12928bbd4f1334248a79de1c1ae93, creatorNodeId=4, birthRound=534761], hash=f1c722ff34bd4be57d0148674f196e90c5111dc80c618a83c5b6bd1431378403bee12928bbd4f1334248a79de1c1ae93, creator=4]
sp: EventDescriptorWrapper[eventDescriptor=EventDescriptor[hash=9e4f434e02c69bb0285b7f891b8dacd36c6a213e91fc2a8a8f5d2be5babf88e8385be54531abfa1269b739bf47c4fdda, creatorNodeId=4, birthRound=534761], hash=9e4f434e02c69bb0285b7f891b8dacd36c6a213e91fc2a8a8f5d2be5babf88e8385be54531abfa1269b739bf47c4fdda, creator=4]
op0: EventDescriptorWrapper[eventDescriptor=EventDescriptor[hash=ca8f070e3a8d5996149d7391d7a5e1d1a5edc3494abc3811a4d73db40ed570c5288f9158525dee182fd4d6eaae33a5c4, creatorNodeId=26, birthRound=534761], hash=ca8f070e3a8d5996149d7391d7a5e1d1a5edc3494abc3811a4d73db40ed570c5288f9158525dee182fd4d6eaae33a5c4, creator=26], Parent EventDescriptor: EventDescriptorWrapper[eventDescriptor=EventDescriptor[hash=9e4f434e02c69bb0285b7f891b8dacd36c6a213e91fc2a8a8f5d2be5babf88e8385be54531abfa1269b739bf47c4fdda, creatorNodeId=4, birthRound=534761], hash=9e4f434e02c69bb0285b7f891b8dacd36c6a213e91fc2a8a8f5d2be5babf88e8385be54531abfa1269b739bf47c4fdda, creator=4]
2025-11-28 16:45:26.417 3291 INFO RECONNECT <> ReconnectStatePeerProtocol: Starting reconnect in role of the receiver. {"receiving":true,"nodeId":27,"otherNodeId":25,"round":534765} [com.swirlds.logging.legacy.payload.ReconnectStartPayload]
2025-11-28 16:45:26.418 3292 INFO RECONNECT <> ReconnectStateLearner: Receiving signed state signatures
2025-11-28 16:45:26.427 3298 ERROR EXCEPTION DefaultUncaughtExceptionHandler: Uncaught exception in gossip
java.lang.IllegalStateException: Initial event window not set
at com.swirlds.platform.gossip.shadowgraph.Shadowgraph.addEvent(Shadowgraph.java:506)
at com.swirlds.platform.gossip.shadowgraph.AbstractShadowgraphSynchronizer.addEvent(AbstractShadowgraphSynchronizer.java:253)
at com.swirlds.component.framework.wires.input.BindableInputWire.lambda$bindConsumer$0(BindableInputWire.java:77)
at com.swirlds.component.framework.schedulers.internal.SequentialTask.onExecute(SequentialTask.java:77)
at org.hiero.base.concurrent.AbstractTask.exec(AbstractTask.java:68)
at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:387)
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1312)
at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1843)
at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1808)
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:188)
2025-11-28 16:45:26.427 3296 ERROR EXCEPTION DefaultUncaughtExceptionHandler: Uncaught exception in gossip
```

Start with the stack trace at Shadowgraph.java:506 and follow addEvent() through AbstractShadowgraphSynchronizer.java:253. Review the reconnectController sequence around the missing-parent error and the subsequent “Initial event window not set” exception. Done means repeated reconnects no longer produce either failure.

Written by the indexing model from the issue text.