To demonstrate the problem, create a Scriptler script as follows:

println binding.variables
first = binding.variables.get('First').tokenize(',')
return first

Name is unimportant. Then create a Jenkins job with three parameters:

1. Active Choices Parameter, Name: First, Script: Groovy Script:

return ['One','Two']

Choice Type: Check Boxes

2. Active Choices Reactive Parameter, Name: Second, Script: Groovy Script: same as the scriptler script:

println binding.variables
first = binding.variables.get('First').tokenize(',')
return first

Choice Type: Single Select, Referenced Parameters: First

3. Active Choices Reactive Parameter, Name: Third, Script: Scripter Script, Script: (whatever you named the scriptler script above), Choice Type: Single Select, Referenced Parameters: First

Save; run the script using Build With Parameters.

Expected behavior: Checking checkboxes in First causes drop-down lists to be updated with checkbox items in Second and Third.

Observed behavior: Checking checkboxes in First causes drop-down lists to be updated with checkbox items in Second but not in Third.

Further confirmation: Verify binding.variables content in log. Switch Second and Third's script type and script contents and rerun.