Hi @Adrian_Chan and welcome to the Forum!
Unfortunately, as it stands comments won’t carry over with repeating tasks; but here is how you achieve a similar result:
Create a task in which you add your description + comments, and add a subtask to this task that you set to repeat. A new subtask will be generated every time you complete the previous one, but all your comments and description will be kept safe in the parent task.
I understand this is not ideal, but it might be a good solution for the time being.
We already have a thread in the Forum on this topic, so I’ve gone ahead and merged your post with this main topic. I’ve also moved the thread to the #productfeedback category to allow you and other users to vote for this feature.
If tehre is anything else I can help you with, please let me know!