For me it is logical that on the cemeteries (without access for caravans or boats) no water_point can be placed. I have checked this on the map one by one, so I did not assume automatic processing (according to wiki).

Sorry for my mistake. Should I undo the processing or start a discussion in the mailing list afterwards?

I use overpass turbo only for search. I manually checked all points on the map to see if they are located in a cemetery. I couldn't see that any of the points are water_points for caravans etc.

I have searched all water_points within an (area) cemetery using overpass. And water_point are places where you can get larger amounts of "drinking water" for filling a fresh water holding tank, such as found on caravans, RVs and boats. No tanks for caravans are filled up inside a cemetery.
regards mbs