From experimentation, it would seem that anchored objects are not moved to their anchored position until after the events in an "On start of layout" trigger.
Is this correct? I have been working on a minimap with the MM field anchored, and calculating the offset would come out wrong if the calcs were done in the "start of layout" trigger, but they'd come out right if done anytime after that. I ended up making a combination trigger of "every tick" plus a do-once condition to make it work.
I would just like to confirm the theory and make sure I am not making an assumption that will mess me up later.