Scheduled campaign marked all contacts as “Goal Reached” after updating email template before send time

We had a sales email scheduled to send two weeks in advance. I pressed “Start” so it would trigger at the scheduled time, however during that two-week period I needed to update the email text.

I replaced the original email in the campaign with the updated version, but when the scheduled send time arrived, the email didn’t send to any of the audience. I later realised that when I initially pressed “Start” and scheduled the campaign, all contacts had already been pushed to “Campaign Goal Reached” — even though the scheduled send time hadn’t occurred yet.

My assumption is that the contacts remained associated with the original email version when the campaign was first started. Other sales campaigns are still scheduling and sending correctly, and contacts continue to reach the goal as expected.

I’m trying to understand the correct process for updating email content after a campaign has been scheduled and started, but before the scheduled send time is reached. Is simply replacing the email enough, or do I also need to update/reconfigure something within the campaign itself?