WikiMacro parameters are wrongly set to their default value, depending of their order in macro call

Here is a weird bug with wikimacro parameters: depending of the order they are declared in the macro call, they do or do not fallback to their default value.
For example, a macro with 3 parameters:

• pattern
• sortyBy (with default "date")
• sortOrder (with default "descending")

calling this macro like so

{{bug
  patterns=".*jpeg"
  sortBy="size"
  sortOrder="descending"
/}}

would give:

patterns: .*jpeg
sortBy: date
sortOrder: descending 

whereas

{{bug
  sortBy="size"
  patterns=".*jpeg"
  sortOrder="descending"
/}}

would show:

patterns: $wikimacro.parameters.patterns
sortBy: size
sortOrder: descending

Strangely enough, the sortOrder parameter is never set to its default value, whatever its order is.

You can find attached to the ticket a minimal reproduction page for this issue. Just call the macro like the one of the examples above.