I have many users and this drop-down seems to stop at users with the last name of D... Looks like there is a very small limit on this drop-down. Maybe a bug?
How many users do you have? The job_manager.xml file shows a count param of 250 max for that dropdown list.
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Sounds like it might be configurable?
Yes, the parameter element in the XML file is nested under a module called: "EntitySelectLister"
param name="count" 250