<aura:application extends="force.slds"> <c:abc a="a" b="a,b,c" c="c" /> </aura:application> 

<template> {d} {e} <template if:true={deWired}> Data: {deWired.data} Error: {deWired.error} </template> </template> 

import { LightningElement, wire, track, api } from 'lwc'; import getDE from '@salesforce/apex/ABCCont.getDE'; export default class Abc extends LightningElement { @api a; @api b; @api c; @wire(getDE, { a:this.a, b:this.b.split(','), c:this.c}) deWired = {}; @track d; @track e; @track error; connectedCallback() { getDE({ a:this.a, b:this.b.split(','),c:this.c}).then(result=>{ this.d = result.d; this.e = result.e; }).catch(error => { this.error = error; }); } } 

@wire(getDE, { a:this.a, b:this.b.split(','), c:this.c}) deWired = {}; 

public inherited sharing class ABCCont { @AuraEnabled(cacheable=true) public static Map<String, Object> getDE(String a, List<String> b, String c) { return new Map<String, Object>{'d'=>'d','e'=>'e'}; } } 

 <aura:application extends="force.slds"> <c:abc a="a" b="a,b,c" c="c" /> </aura:application> 

 <template> {d} {e} <template if:true={deWired}> Data: {deWired.data} Error: {deWired.error} </template> </template> 

 import { LightningElement, wire, track, api } from 'lwc'; import getDE from '@salesforce/apex/ABCCont.getDE'; export default class Abc extends LightningElement { @api a; @api b; @api c; @wire(getDE, { a:this.a, b:this.b.split(','), c:this.c}) deWired = {}; @track d; @track e; @track error; connectedCallback() { getDE({ a:this.a, b:this.b.split(','),c:this.c}).then(result=>{ this.d = result.d; this.e = result.e; }).catch(error => { this.error = error; }); } } 

 @wire(getDE, { a:this.a, b:this.b.split(','), c:this.c}) deWired = {}; 

 public inherited sharing class ABCCont { @AuraEnabled(cacheable=true) public static Map<String, Object> getDE(String a, List<String> b, String c) { return new Map<String, Object>{'d'=>'d','e'=>'e'}; } } 

[![enter image description here][1]][1]

it works like a charm. So looks like the problem is with wired property. Is there any way to use a wired property here? Are we obliged to use only Imperative Apex in this case? [1]: https://i.sstatic.net/d0RVW.png

it works like a charm. So looks like the problem is with wired property. Is there any way to use a wired property here? Are we obliged to use only Imperative Apex in this case?

Apex controller is irrelevant here, but just for reference listing of dummy ABCCont

public inherited sharing class ABCCont { @AuraEnabled(cacheable=true) public static Map<String, Object> getDE(String a, List<String> b, String c) { return new Map<String, Object>{'d'=>'d','e'=>'e'}; } }