I have all projections on, and the following extras that I have added to my 3.3 and 3.4 Event Stores
LinkTos will come up in any $all projection (they are events too). You
would have to check if the event is a linkTo or not. I also have to
look if there is a way of turning off links (there should be if there
is not). I am putting up an issue to track (it may already do it I
just don't know off the top of my head)
https://github.com/EventStore/EventStore/issues/890:
Greg
The issue has been updated with the PR that contains the relevant logic to make the option work.