Have there been cases where data was updated but the visual display of these changes did not occur?

Yes, such a situation has occurred. Usually, this happens when data is updated in the model or database, but the UI does not receive a notification about the changes and does not redraw.

The reasons can vary:

• The UI update method was not called, for example, notifyDataSetChanged() in RecyclerView adapters.
• Using an inappropriate pattern for data updates, such as the absence of observers or LiveData.
• Data is updated in the background, but not on the main thread, causing the UI not to update.

To avoid this, it is important to:

• Use architectural patterns (MVVM, MVP) with reactive components.
• Ensure that UI updates are called on the main thread.
• In RecyclerView adapters, call methods to notify data changes.

Example for RecyclerView:

myAdapter.setData(newDataList);
myAdapter.notifyDataSetChanged();

This guarantees that the visual display matches the current data.