Here is a screenshot of the logistics system stats where you can see the bot use:

For context, my base has tens of thousands of jobs currently available for that concrete to be placed down.
So I have:
1. Over a thousand construction bots available
2. Thousands of concrete available for pick up
3. Thousands of concrete placement jobs available
And I only have like 200 bots in use for large periods of time? There have been times where those 3 things are true and I have 0 bots in use. It's crazy.
Is this a bug? Is this an optimization of bots for when there are a large amount of pending jobs? I don't understand what's happening. All I know is that I should never have zero bots in action when there are thousands of jobs available to be completed.
I can provide the save file if necessary.