Steps to reproduce:

Given: I install the Active Choice Parameter plugin
When: I configure a job to have an Active Choice Parameter having a Groovy script
And: I set an option as selected in the Groovy script, but not the first option
And: I configure the job to build periodically (using cron)
Then: The job should start with the selected option as for the parameter value

Instead: The job starts with the first option from the groovy script and not with the selected one.

eg.

Having one Active Choice parameter, named "options" defined by the following Groovy script:

return[
'option1',
'option2:selected',
'option3'
]

Then, if you build the project by using a system groovy script like this:

import hudson.model.*
 
// get ACP 'options'
def resolver = build.buildVariableResolver
def optionsACPValue = resolver.resolve("options").toString()

// print 'options' ACP value

println ("ACP value: '$\{optionsACPValue}'.")

Output

If you build manually you will get:

*option2*

and if you build periodically (using cron), the output will be:

*option1*