Validate option does not work in combination with the args option

[LukasHoerger]

Thank you for this package!

I found a small bug in combination of the two options -args and -validate.
Consider the following example:

proc myOk {args} {
  return 1
}

proc validateIssue {args} {
  parse_args::parse_args $args {
    -filterValid {-args 2}
    -filterInvalid {-args 2 -validate myOk}
  }
  puts "$filterValid $filterInvalid"
}

validateIssue -filterValid 1 a -filterInvalid 2 b

the expected output would be 1 a 2 b but instead it is only 1 a .
If i change the args count to 1 everything works as expected.

I'm using version 0.5.1.
If there is any additional information I can provide, please let me know.

Thank you in advance
Lukas