FixedEffort is not calculating task dates if no duration provided

[chuckn0rris]

Forum post

i have assigned a resource for the task 100% and for the each task schedulingMode is "FixedEffort"

Task.tsx: below is the code

import { TaskModel } from '@bryntum/gantt';

// here you can extend our default Task class with your additional fields, methods and logic
export default class Task extends TaskModel {

declare deadline: Date;

static get fields() {
    return [{ name : 'deadline', type : 'date' },
        { name : 'schedulingMode', default : 'FixedEffort' }

    ];
}
get effortUnit(){
    return "d";
}
get constraintType(){
    return "assoonaspossible";
} 
get isLate() {
    return this.deadline && Date.now() > this.deadline.getTime();
}

get status() {
    let status = 'Not started';

    if (this.isCompleted) {
        status = 'Completed';
    }
    else if (this.endDate && (this.endDate as Date).getTime() < Date.now()){
        status = 'Late';
    }
    else if (this.isStarted) {
        status = 'Started';
    }

    return status;
}
}

i have attached the task that is assigned with resource and schedulingMode as FixedEffort, please notice the Start ,Finish ,Duration is not automatically calculating.