I have an upcoming trip that starts on day 1 with a DH to layover. The DH flight has since been canceled. Should that trigger 23K or does it have to be an operating leg that cancels or changes prior to report.

There is a later DH flight that they could theoretically change it to that would still provide a (barely) legal layover so I'd like to know if changing the initial DH is a 23K event before I call especially since I picked this trip up as a recovery slip which should make it Double 23K