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Looks like there is another potential issue around get_winning_root_and_participants.
Assuming there are two sibling epochs: e1 and e2. Considering the case when attestations att.e1.shard_n and att.e2.shard_n have been added to the state during epoch e2.
In that case get_winning_root_and_participants will have to deal with two attestations for shard_n during e2 -> e3 transition where crosslink_data_root of att.e1.shard_n could potentially win.
Issue
After transition to a 3rd epoch crosslink of an attestation created in the last slot of 2nd epoch becomes outdated.
Steps
The steps are taken from simulation with 4 shards and 4 slots in the epoch:
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