[gstat] simple reboxing test fails

data3D.out <- krige(formula=v ~ 1, data3D.in, grid3D.out)
summary(data3D.out)
# gets
#> Object of class SpatialGridDataFrame
#> Coordinates:
#>      min max
#> [1,]   0   8
#> [2,]   0   8
#> [3,]   0   8
#> Is projected: NA
#> proj4string : [NA]
#> Grid attributes:
#>   cellcentre.offset cellsize cells.dim
#> 1               0.5        1         8
#> 2               0.5        1         8
#> 3               4.0        8         1
#> Data attributes:
#>    var1.pred    var1.var
#>  Min.   :1   Min.   : NA
#>  1st Qu.:1   1st Qu.: NA
#>  Median :1   Median : NA
#>  Mean   :1   Mean   :NaN
#>  3rd Qu.:1   3rd Qu.: NA
#>  Max.   :1   Max.   : NA
#>              NA's   :64

What should I call to get the values for the output grid boxes?

Did you notice the predictions in var1.pred values are all 1?