Problems with playground assistant in the simulation of response to functions

I have to repeat the answer twice but first I have to make a change, albeit minimal, for example by adding a space somewhere, if I don’t do it it remains blocked waiting for a response, example: {“success”:true}, I try submit and then I add a space after “success”{“success” : true}, , I submit again and the assistant starts working again, for example:
appointment(
{ “name”: “marco”, “telephone”: “3476606123”, “date”: “Thursday”, “time”: “10:30” })
{ “success” :true}
I found out when it happens, when two functions are requested simultaneously:
verifyvehicle(
{“license plate”:“FY123FW”})
success:true
showzones(
{“license plate”:“FY123FW”})
{ “success”: true,“zone” : “galilei”, “zone” : “stazione”}