Querying for executor status and currentExecutable doesn't indicate the ongoing job on that executor like it used to show previously:

https://<jenkins>/computer/api/json?tree=computer[offline,displayName,executors[currentExecutable[url]],oneOffExecutors[currentExecutable[url]]]

{"currentExecutable":null}

In previous versions (Jenkins ver. 1.651.3) the query also indicated the currently ongoing job:
{"currentExecutable":

{"url": "https://<jobURL>/"}

}