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I believe this is due to the fact that Reminders are not events, but they're basically what To-Dos were back in the iCal days. I will file a bug report about this.

One possible workaround is to set up a "Sync Tasks to/from Calendar To-Do Items" action in OmniPlan, but that requires that you enter your iCloud information as a CalDAV server and it's a bit tricky figuring out the server address that your account is located on in iCloud. All the tutorials I could find online on how to figure out your CalDAV server address on iCloud are out-of-date, unfortunately.