feat(f3): change F3 HeadLookback to 4 (#12648)

Signed-off-by: Jakub Sztandera <oss@kubuxu.com>

CHANGELOG.md

@@ -19,7 +19,8 @@
 - Fix hotloop in F3 pariticpation API ([filecoin-project/lotus#12575](https://github.com/filecoin-project/lotus/pull/12575))
 - Fix a bug in F3 participation API where valid leases may get removed due to dynamic manifest update. ([filecoin-project/lotus#12597](https://github.com/filecoin-project/lotus/pull/12597))
 - Change the F3 participation ticket encoding to allow parity testing across non-go implementations, where a ticket issued by Lotus may need to be decoded by, for example, Forest . The changes also enforce the minimum instance participation of 1 for miners. ([filecoin-project/lotus#12615](https://github.com/filecoin-project/lotus/pull/12615))
-- Fix issue where F3 wouldn't start participating again if Lotus restarted without restarting the Miner ([filecoin-project/lotus#1240](https://github.com/filecoin-project/lotus/pull/12640)).
+- Fix issue where F3 wouldn't start participating again if Lotus restarted without restarting the Miner ([filecoin-project/lotus#12640](https://github.com/filecoin-project/lotus/pull/12640)).
+- Change the F3 HeadLookback parameter to 4 ([filecoin-project/lotus#12648](https://github.com/filecoin-project/lotus/pull/12648)).
 
 ## Deps
 

chain/lf3/config.go

@@ -57,7 +57,7 @@ func NewManifest(
 			Finality:                 int64(finality),
 			DelayMultiplier:          manifest.DefaultEcConfig.DelayMultiplier,
 			BaseDecisionBackoffTable: manifest.DefaultEcConfig.BaseDecisionBackoffTable,
-			HeadLookback:             0,
+			HeadLookback:             4,
 			Finalize:                 true,
 		},
 		CertificateExchange: manifest.CxConfig{