This has nothing to do with thieves. They changed how the handles wilderness, and insteed of a single value it now has two: a room can be both ranger AND thief friendly.

However, as part of this release, it was discovered that Langenfirth's wilderness percentage was set incorrectly and violated global caps. They were brought more in line with the design of how the bonus is supposed to be calculated, but Langenfirth's settings are still lower than they should be if they had been written following the standards.