AZ-104: Monitor and back up Azure resources - Logs demo environment hardly returning any results

Question

In 'Logs demo environment' of the the unit 'Create basic Azure Monitor log queries to extract information from log data' from module 'AZ-104: Monitor and back up Azure resources' the queries in exercises 2, 4 and 6 do not return any results. Here is an example of exercise 2:

The same applies for exercises 4, 5 and 6 from 'Use predefined Azure log queries to extract information from log data' in the same unit. Here is an example of exercise 6:

Is the demo data broken?

This question is related to the following Learning Module