core/overlay: copy BaseRoot in TransitionState.Copy (ethereum#32613)

Galoretka · Sahil-4555 · commit f85a8bb3c67a · 2025-10-12T13:13:10.000+05:30
This change ensures TransitionState.Copy preserves BaseRoot. During a
Verkle transition, ts.BaseRoot is required to construct the overlay MPT
when ts.InTransition() is true. Previously, copies dropped BaseRoot,
risking an invalid zero-hash base trie and inconsistent behavior.
diff --git a/core/overlay/state_transition.go b/core/overlay/state_transition.go
@@ -60,6 +60,7 @@ func (ts *TransitionState) Copy() *TransitionState {
 		CurrentSlotHash:       ts.CurrentSlotHash,
 		CurrentPreimageOffset: ts.CurrentPreimageOffset,
 		StorageProcessed:      ts.StorageProcessed,
+		BaseRoot:              ts.BaseRoot,
 	}
 	if ts.CurrentAccountAddress != nil {
 		addr := *ts.CurrentAccountAddress

Original file line number	Diff line number	Diff line change
`@@ -60,6 +60,7 @@ func (ts TransitionState) Copy() TransitionState {`
`60`	`60`	`CurrentSlotHash: ts.CurrentSlotHash,`
`61`	`61`	`CurrentPreimageOffset: ts.CurrentPreimageOffset,`
`62`	`62`	`StorageProcessed: ts.StorageProcessed,`
	`63`	`+ BaseRoot: ts.BaseRoot,`
`63`	`64`	`}`
`64`	`65`	`if ts.CurrentAccountAddress != nil {`
`65`	`66`	`addr := *ts.CurrentAccountAddress`