HI @Alex_Bailey1 and thank you for taking time to report this!
You are completely correct in noticing that you are not able to create a Sections in the Later Section of your My Tasks List. This is actually not a Bug but a recent changed we have made.
Please let me provide you with some context on this change: we are currently in the process to allow all users to convert Projects between the List and Board format.
Building this functionality required that both views function similarly on the backend and, due to Lists being several years older than Boards, this wasn’t the case to start with. While updating Lists, we’ve decided to remove the functionality you have noted today since it was both time-intensive to update and are infrequently used.
I apologize for any inconvenient that this might have cost you. If you have any further questions or queries, please let me know and I’ll be happy to assist you further.
Have a nice day!