When the video setting "FOV effects" is reduced from 100% and the player steps on terrain that lowers player speed (e.g. dirt), the actual FOV is heavily reduced, as opposed to being closer to the "FOV" option. I suppose that the mod increases FOV to cancel out the FOV reducing effect in lower speed, but the FOV increasing is unexpectedly influenced by the setting "FOV effects"?

This issue is now resolved with a new config option and changed functionality as of the most recent hotfix for Version 1.3.2.