Filter out headers
First of all why is the "header" with star * an undocumented feature? Are there any more one like these? :)
Second, these aren't tasks, so why do they show up in searches. I want to filter them out somehow?
This is a deprecated feature which we'll no longer support, that's why it's not documented anymore. You can still use it as it may be available for a while, but could cause inconsistencies across platforms. Sorry for the inconvenience.
Thanks, any chance of filtering them out in search?
That's unfortunately not possible, they're treated exactly as regular tasks. If you would assign a label to each of them, you could then use a negative !@label filter.