Survey variables lost when task lauched by scheduler

[dobnob]

Hi
I'm confused
I have simple playbook for update windows servers.

There is (in playbook) included second one for checking services status after updates.
- import_playbook: /var/lib/semaphore/repo/win_services_check_inc.yml

I have defined additional variable as "Survey Variable" lets say "Email_Subject".
When I run "01 Windows Update - only check" manually from ui it works as it should.

When it's invoked by scheduler it fails:
"The task includes an option with an undefined variable.. 'Email_Subject'"

Is that bug or am I doing something wrong?