Unlike the west where some landowners are very militant about contesting corner crossings and some states even have specific laws that corner crossing is always trespassing, things aren’t that clear in MN. This was discussed some years ago on a Facebook group and several claimed that there are no cases in MN that specifically prosecuted someone only for public land corner crossing trespass so it is very unclear as to where MN is on this issue. Also, unlike the west, our trespass laws are slanted toward not being able to prosecute for trespass if the offender voluntarily leaves, whereas in some wester states you can be prosecuted even after you left if evidence can be presented.
The safest move is to get written permission from one of the two “corner” landowners to cross. Next safest move is to contact a CO for an answer.
The problem with landlocked private land, is adjacent landowners tend to start viewing the parcel as part of their own property and are militant about keeping others out. They use call-ins to LE as a method to harass hunters even when they know nothing illegal is occurring. So the potential of getting called in can be very high in some areas.