About App Icon Link on Reminders app
GoodTask uses and shares default Apple's Reminders app's data. There is an app icon link on default Reminders app (like above screenshot) if you make a reminder via Siri or Share button on Safari or other few apps. This link data is locked on Apple's Reminders app only and is not accessible through GoodTask.
You need to be cautious about the task with this link when used in GoodTask. Actions such as changing lists in GoodTask removes this data so if the link is important, don't edit it in GoodTask. URLs can be saved through GoodTask share extension which is recommended for various advanced uses inside GoodTask.
I've requested Apple to give access to this data but it hasn't gone through yet. When it does, it'll be supported asap. Thanks!