What potential issue can occur when handlers are not properly defined in Blocks?

When handlers are not properly defined in Blocks, one significant issue that can arise is memory leaks due to lingering listeners. In an OutSystems application, Blocks can contain event handlers that respond to various actions or events. These handlers are often set up as listeners to specific events related to user interactions or data changes.

If these handlers are not properly disposed of or if their scope is not correctly managed when the Block is no longer in use, they can continue to exist in memory. This can lead to memory leaks, as the references to these handlers prevent the associated resources from being released. Over time, these memory leaks can accumulate, leading to increased memory consumption and potentially degrading application performance or causing crashes.

This issue emphasizes the importance of carefully managing event handlers in Blocks to ensure that when a Block is removed from the application's UI, any bound event listeners are also properly cleaned up. This vigilance helps maintain optimal resource usage and application stability. Other potential issues listed, such as excessive data fetching or incorrect UI rendering, may arise from different misconfigurations, but they do not directly relate to the continued presence of improperly defined handlers.