Welcome to the Forum @anon64776313 and thank you for reaching out!
I can confirm this is not a Bug but actually a new update we are currently rolling out regarding your My Tasks. Please have a look at this post I just wrote regarding this topic: Unable to see Calendar view for other members - #2 by Natalia
Apologies for the confusion this might have caused you and of course if you have any follow-up questions, please let us know!