In my opinion, for now the best thing to do is if you are using the betas, just use the Reminders app for now. It's not that buggy. We don't know what changes Apple is making to the iCloud and Goodtask could still break again. Apple won't release their new APIs until the GM is released in late August or early September. That's when Devs can start fixing their apps for the new OS's.
From what Ive read on apple Dev site and in other forums, Apple is changing their iCloud, which is why beta.icloud.com exists and why many on Catalina beta and other betas are having iCloud issues. Once the GM or release releases come out and we hit the upgrade button in Reminders, we don't even know if Goodtask will continue to work or not. We have to allow the developer time to make changes and make sure everything will work with the new Reminders app and iCloud changes.
On a personal note, I love the time and energy that the Dev has spent on Goodtask, it's a great app and I think you forced Apple to change their default Reminders app to add sub-tasks and so much more. So thank you on a personal level...
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