head API event incorrect data

[mcdee]

Describe the bug

Comparing the output of the head event across beacon nodes it appears that nimbus has swapped the values for current_duty_dependent_root and previous_duty_dependent_root.

Data was obtained using curl -N -H "Accept:text/event-stream" 'http://localhost:5051/eth/v1/events?topics=head'

Sample from lighthouse:

{
  "block": "0x300be7603b25f14f7cfcc9dc4f7deecd91736946d5b5ddd9f78e165e21e67797",
  "current_duty_dependent_root": "0x33fd1a2595bf102f48c3af7a211752cbccf9b62344e5b0de437638ba202f82e5",
  "epoch_transition": false,
  "execution_optimistic": false,
  "previous_duty_dependent_root": "0xb2359130d65053c3e8646997f175a5937798bd4740535800fade712f1ab4bf84",
  "slot": "4693183",
  "state": "0x2e23b0774429f389ab51f6cc887c37123319ed8a44478859ad10799318c8135a"
}

Sample from nimbus:

{
  "block": "0x300be7603b25f14f7cfcc9dc4f7deecd91736946d5b5ddd9f78e165e21e67797",
  "current_duty_dependent_root": "0xb2359130d65053c3e8646997f175a5937798bd4740535800fade712f1ab4bf84",
  "epoch_transition": false,
  "execution_optimistic": false,
  "previous_duty_dependent_root": "0x33fd1a2595bf102f48c3af7a211752cbccf9b62344e5b0de437638ba202f82e5",
  "slot": "4693183",
  "state": "0x2e23b0774429f389ab51f6cc887c37123319ed8a44478859ad10799318c8135a"
}

Sample from prysm:

{
  "block": "0x300be7603b25f14f7cfcc9dc4f7deecd91736946d5b5ddd9f78e165e21e67797",
  "current_duty_dependent_root": "0x33fd1a2595bf102f48c3af7a211752cbccf9b62344e5b0de437638ba202f82e5",
  "epoch_transition": false,
  "execution_optimistic": false,
  "previous_duty_dependent_root": "0xb2359130d65053c3e8646997f175a5937798bd4740535800fade712f1ab4bf84",
  "slot": "4693183",
  "state": "0x2e23b0774429f389ab51f6cc887c37123319ed8a44478859ad10799318c8135a"
}

Sample from teku:

{
  "block": "0x300be7603b25f14f7cfcc9dc4f7deecd91736946d5b5ddd9f78e165e21e67797",
  "current_duty_dependent_root": "0x33fd1a2595bf102f48c3af7a211752cbccf9b62344e5b0de437638ba202f82e5",
  "epoch_transition": false,
  "execution_optimistic": false,
  "previous_duty_dependent_root": "0xb2359130d65053c3e8646997f175a5937798bd4740535800fade712f1ab4bf84",
  "slot": "4693183",
  "state": "0x2e23b0774429f389ab51f6cc887c37123319ed8a44478859ad10799318c8135a"
}

[tersec]

#4141 was shipped in v22.9.1