I wanted to have apostles heal up so I started to move them toward nearest holy site I own and I noticed when they entered water the icon for Rest & Repair lighted up. So I thought, great I don't have to go all way out there and clicked on it. Few turns later they haven't healed at all. I had to move them to a holy site where they finally healed. Later as I moved few other apostles, I noticed the Rest & Repair icon lighted up whenever they are in water. I'm not at home so I don't have the patch information but I do have all DLCs and didn't install any mods. It's running on the current patch as well.