Limit to the number of tasks visible in the my tasks list

Summary:

Is there a limit to the amount of tasks visible in the task list in the my tasks section when a user only searches for the task name and does not apply any filters?

Why do I ask this?

Because our customer has noticed that some tasks only appear when the task list is sorted by person name or when the person name is entered in the search bar.

Background information:

Our customer has organized their journeys and their tasks with a number code. Each journey has a fixed number, e.g. 02, 03, 04 etc. Then, a group of tasks get a common number assigned before the task name, e.g. 1, 2, 7. 35 etc. Then, each task in that task group has another number added, e.g. 01,02,03,04 etc. The final task name looks like 02_40_02 Task Name for example.