I just wasted a long time trying to make one of my decks hit a certain budget, not realizing the problem was that I had selected a preferred basic mountain printing from Portal that was kind of expensive. That money was counting towards my total (even though basic lands are usually ignored), I couldn’t figure out how my deck still cost so much after a cople hours of editing until I finally added up the cards type by type only to realize I’d been barking up the wrong tree.

Update to Cheapest does override preferred printings. The issue is that basic lands get excluded altogether, which happens regardless of whether or not you have a preferred printing set for it. There is a bit of code entanglement when it comes to basic land handling in general, and this behavior gets caught up in it. This has been noted though, since I believe the plan is to disentangle and rework how basic lands are handled. It is a bit complicated, since there are varying opinions from the userbase on how to handle them.
Thanks. I’m open to any behavior as long as it is consistent and predictable.