fix: iteration itemType support conversation var (#22220) (#22236)

web/app/components/workflow/nodes/_base/components/variable/utils.ts

@@ -612,6 +612,7 @@ const getIterationItemType = ({
 }): VarType => {
   const outputVarNodeId = valueSelector[0]
   const isSystem = isSystemVar(valueSelector)
+  const isChatVar = isConversationVar(valueSelector)
 
   const targetVar = isSystem ? beforeNodesOutputVars.find(v => v.isStartNode) : beforeNodesOutputVars.find(v => v.nodeId === outputVarNodeId)
 
@@ -621,7 +622,7 @@ const getIterationItemType = ({
   let arrayType: VarType = VarType.string
 
   let curr: any = targetVar.vars
-  if (isSystem) {
+  if (isSystem || isChatVar) {
     arrayType = curr.find((v: any) => v.variable === (valueSelector).join('.'))?.type
   }
   else {