Infinite calendar not infinite?

Not sure if this is a bug or intentional but I am finding the Infinite Calendar option for the Recent widget to only show the last 100 episodes I haven’t seen.

This may seem like a silly issue but sometimes I add shows I haven’t seen that already have over 100 episodes and I use the widget to easily mark off episodes I watch, especially if the show is non serialized and can be watched in any order.

If the limit is intentional, then perhaps rename the Infinite Calendar feature?