Also allows you to fill bottles from people.

This is caused by the rework of ActionTargets to include the water type of the surface below them, regardless of whether or not it is appropriate for the target to contain this data. This, combined with changes to CCTWaterSurfaceEx and a lack of sanity checking in ActionDrinkPondContinuous means that whenever you look at any object, including players, located above a water surface, the option to drink from the water below is displayed.

@Geez Can you at least give us the information present in the dump files? What are the values of variables in the stack at the time? What are the classnames of the objects failing FSM state reconciliation? Which objects have been dereferenced? If this is, as you believe, an issue with modded content then we need more information to work around it.