[HOLESKY PECTRA] attestation production on fork

[rolfyone]

network upgrade: ELECTRA
              _____ _           _
             | ____| | ___  ___| |_ _ __ __ _
             |  _| | |/ _ \/ __| __| '__/ _` |
             | |___| |  __/ (__| |_| | | (_| |
             |_____|_|\___|\___|\__|_|  \__,_|
2025-02-24 21:55:12.105 INFO  - Epoch Event *** Epoch: 115968, Justified checkpoint: 115967, Finalized checkpoint: 115966, Finalized root: a877fa384c458da333e2d71e53ab40467c4ce5400e6417d5562b111c717304b7
2025-02-24 21:55:12.113 INFO  - Block performance: epoch 115967, expected 1, produced 1, included 1 (100%)
2025-02-24 21:55:12.113 INFO  - Sync committee performance: epoch 115967, expected 160, produced 64, correct 60, included 54 (84%)
2025-02-24 21:55:16.309 INFO  - Slot Event  *** Slot: 3710976, Block:                                                        ... empty, Justified: 115967, Finalized: 115966, Peers: 99
2025-02-24 21:55:16.478 ERROR - Validator   *** Produced invalid attestation for slot 3710976. Invalid reason: Attestation is not a valid indexed 

is this just an edge case?