Why cron activity cannot be the first activity?

In Cron activity there is a check for the first pass.
And if it is a the first pass elsa doesnt execute the cron activity as planned, what is the reason for this?

I have tried to remove that check, and it works also as the first activity, so what was the intention of adding that check?

Start by locating the Cron activity and its first-pass check, then compare the behavior when the check is present with the behavior when it is removed. Done means the intended reason for skipping a first activity is established and the issue is answered or the behavior is documented.

Written by the indexing model from the issue text.