Stupid people do stupid things. Missing exceptions is unforgivable. So many tracts have exceptions for any of a thousand reasons. One that gets overlooked from time to time is the tract deeded to a school in the 1800's as this area developed. The school closed in the 1940's and the building disappeared sometime in the next 20 years or so. But, the tract was never officially conveyed to the adjoiner. While on the local school board about 25 years ago, we had two cases of being asked to provide quit claim deeds to former school tracts as the successor school district to the successor school district to the original school district. A part of that problem is that some of the original school tracts had deeds that said the tract was to pass to heirs of the original land owner who gave the land, not the owner of the adjoining tract from which is was taken in the first place. Trying to track down about five generations of heirs and getting every last one to sign a deed would be quite a challenge.
