CSV Instance Parameters are disappeared during edit webhook step

When I have a webhook step with CSV data type and I set some Data Type parameters ( e.g. Delimiter ),

the parameters are probably not saved because when I edit that step, the parameters windows is empty

and also DataMapper show only one field (csv has 5 columns)

Video: csv.webm

When I run that integration, it looks that the CSV is processed as one string. Log step:

	
Body: [[csv0,0,0.0,1989-05-05,true
csv1,10,10.0,1989-05-05,true
csv2,20,20.0,1989-05-05,true
csv3,30,30.0,1989-05-05,false
csv4,40,40.0,1989-05-05,false]]

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Another example,
when I set `First Record As Header` and `Delimiter ,` as CSV Instance Parameters for this CSV definition

sourceCsvString,sourceCsvNumber,sourceCsvDecimal,sourceCsvDate,sourceCsvBoolean
csv0,0,0.0,1989-05-05,true
csv1,10,10.0,1989-05-05,true
csv2,20,20.0,1989-05-05,true
csv3,30,30.0,1989-05-05,false
csv4,40,40.0,1989-05-05,false

the DataMapper field looks like one string ( unable to use it for mapping)