This seems to happen every few months and I have no idea why (and neither does tech support)!
I use GoodTask exclusively on my Apple Watch. I can enter a Reminder on my iPhone or on my watch directly (usually using Siri) and it will be populated in the complication on my watch correctly. However, when I add an Event on either my iPhone or my watch it will not show up in the complication on my watch. If I open the app on my iPhone the Event is present.
Any ideas why Events do not show up on the watch, only Reminders?