Specialized Question Types - The question.isDesignMode doesn't return the actual value

[JaneSjs]

T19649 - Custom components, in read-only mode, I cannot set default values.
https://surveyjs.answerdesk.io/internal/ticket/details/T19649

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View Demo
Task: to allow users to edit a specialized question and set its default value at design time, however, disable the question in preview.

I thought that I can use the question.isDesignMode setting to check whether or not a question is in design mode. However, the question.isDesignMode returns false within the onCreated, onLoaded, onAfterRender functions. The question.isDesignMode only returns true in onAfterRenderQuestion event for the first time. When you click the Default Value editor, the isDesignMode again returns false.

Therefore, I cannot conditionally enable or disable a specialized question type using the ICustomQuestionTypeConfiguration and Question API. As an option, I can enable the readOnly option when a SurveyModel is initialized.

const allQuestions = options.survey.getAllQuestions();
allQuestions.forEach(q => {
     if(q.getType() === "triggerworkflow"){
          q.readOnly = true;
    }
})

However, I though that I would implement the required business logic at the level of my custom component.