getEventArgs().getSaveMode() returns Undefined for Disqualify the Lead

Hi, I have been working with dynamics 365 v9.0 and I have been facing the issue to get saveMode on Lead disqualify.

Please refer below link:

docs.microsoft.com/.../getsavemode

As per the above link getEventArgs().getSaveMode() should returns 15 for disqualify. In version 8.2 I'm getting the 15 for disqualify as I should but in V9.0 It returns Undefined. Please refer below screenshot:

Does anybody help me for this issue?

Your suggestion would be appreciated.