[bug] property behavior is different in v3.8 and v3.6

[dumganhar]

Reported at https://forum.cocos.org/t/topic/160220

Test code:

import { _decorator } from "cc";

const { ccclass } = _decorator;

@ccclass('absTest')

export abstract class absTest<T> {

    constructor(value: T) {

        this.Update(value);

    }

    private _bbb: T;

    public get bbb(): T {

        return this._bbb;

    }

    public Update(val: T) {

        this._bbb = val;

        this.OnUpdate();

    }

    protected abstract OnUpdate(): void;

}

import { _decorator } from "cc";

import { absTest } from "./absTest";

const { ccclass } = _decorator;

@ccclass('test1')

export class test1 extends absTest<string>{

    protected OnUpdate(): void {

        this._aaa = "aaaaa";

    }

   

    private _aaa;

    public log(){

        //这里，应该输出 aaaaa,哈哈

        console.log(this._aaa,this.bbb);

    }

}