I'm running KDE Neon User edition. In the "Energy Saving" system settings module, I've set it to suspend session after 20 minutes. It never automatically suspends the session.
I've just tested this with the latest powerdevil and I cannot replicate the issue. Can you please test and confirm if this issue is still occurring or if this bug report can be marked as resolved. I'm setting status to "needsinfo" pending your response, please change back to "reported" or "resolved" when you respond, thanks.
I can no longer reproduce this bug.