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Are you using configuration caching? Do you obtain the numbers from a build scan?

Configuration cache is disabled. Yes, I got the numbers from a build scan, from configuration and task execution sections

What are

All tasks

? The tasks executed from the timeline?

Its the total number of tasks in Task execution

Hmmm... I wouldn't be too worried about task created during task graph building time, though I also don't have a good explanation what is happening there.