Grrovy script in active choise returns the first checkbox when triggered by timer

When invoked by timer the return result is different from expected. This leads to incorrect configurations for build.

Steps:
Defive Grrovy script as:

return ["*","x","#","!","?","p","D"]

Run job manually (dont select any values). Actual/expected:  result value is empty string.
Run job by timer. Expected:  result value is empty string. Actual: value is equal to "*"

More details:
  1. I use Multiconfiguration (matrix) job
  2. I use  groovy sandbox
  3. Fallback script is empty
  4. Choise type == checkbox
  5. I dont use filtering function (Enable Filters == unchecked)
Jenkins version: 2.314
Plugin version - ? (I'm not admin)