🐛 (whatsapp) Fix first message capture regression

Closes #1168

packages/bot-engine/getFirstEdgeId.ts

@@ -0,0 +1,23 @@
+import { TRPCError } from '@trpc/server'
+import { SessionState } from '@typebot.io/schemas'
+
+export const getFirstEdgeId = ({
+  state,
+  startEventId,
+}: {
+  state: SessionState
+  startEventId: string | undefined
+}) => {
+  const { typebot } = state.typebotsQueue[0]
+  if (startEventId) {
+    const event = typebot.events?.find((e) => e.id === startEventId)
+    if (!event)
+      throw new TRPCError({
+        code: 'BAD_REQUEST',
+        message: "Start event doesn't exist",
+      })
+    return event.outgoingEdgeId
+  }
+  if (typebot.version === '6') return typebot.events[0].outgoingEdgeId
+  return typebot.groups[0].blocks[0].outgoingEdgeId
+}