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james-prysm d4613aee0c skipping slot 1 sync committee check e2e (#16145 )

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**What type of PR is this?**

Tests

**What does this PR do? Why is it needed?**

```

--- PASS: TestEndToEnd_MinimalConfig/chain_started (0.50s)
--
--- PASS: TestEndToEnd_MinimalConfig/finished_syncing_0 (0.00s)
--- PASS: TestEndToEnd_MinimalConfig/all_nodes_have_same_head_0 (0.00s)
--- PASS: TestEndToEnd_MinimalConfig/validators_active_epoch_0 (0.00s)
--- FAIL: TestEndToEnd_MinimalConfig/validator_sync_participation_0 (0.01s)
--- PASS: TestEndToEnd_MinimalConfig/peers_connect_epoch_0 (0.11s)


```
This PR attempts to reduce flakes on validator sync participation
failures by skipping the first slot of the block after startup

**Which issues(s) does this PR fix?**

Fixes #

**Other notes for review**

**Acknowledgements**

- [x] I have read
[CONTRIBUTING.md](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md).
- [x] I have included a uniquely named [changelog fragment
file](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md#maintaining-changelogmd).
- [x] I have added a description with sufficient context for reviewers
to understand this PR.
- [x] I have tested that my changes work as expected and I added a
testing plan to the PR description (if applicable).

2025-12-15 20:00:34 +00:00