Issue using reduce_time after a select_time on two dates.

[thegoldenhop]

I am using the gdalcubes project to do some work with ice concentration data and I want to get a difference between two dates.

My initial cube object output looks like this:

A data cube proxy object

Dimensions:
low high count pixel_size chunk_size
t 2016-09-19 2024-05-29 2810 P1D 1
y 75 79 40 0.1 256
x -102 -76 260 0.1 256

Bands:
name offset scale nodata unit
1 Ice_Concentration 0 1 NaN

I am applying the following functions to the cube to get what I want:

trend_function = function(x) {
(x["Ice_Concentration",][2] - x["Ice_Concentration",][1])
}
select = select_time(result, c("2024-05-13", "2024-05-20"))
trend.cube = reduce_time(select, names="Ice_Concentration_Trend", FUN=trend_function)

After the functions are applied I get the following datacube output.

A data cube proxy object

Dimensions:
low high count pixel_size chunk_size values
t 2024-05-13 2024-05-13 1 P0D 1 2024-05-13
y 75 79 40 0.1 256
x -102 -76 260 0.1 256

Bands:
name offset scale nodata unit
1 Ice_Concentration_Trend 0 1 NaN

Then attempting to write the output of the cube as a tif with the following code:

write_tif(trend.cube, dir=tempdir())

Gets me this error:

/usr/include/c++/11/bits/stl_vector.h:1045: std::vector<_Tp, _Alloc>::reference std::vector<_Tp, _Alloc>::operator[](std::vector<_Tp, _Alloc>::size_type) [with _Tp = gdalcubes::datetime; _Alloc = std::allocatorgdalcubes::datetime; std::vector<_Tp, _Alloc>::reference = gdalcubes::datetime&; std::vector<_Tp, _Alloc>::size_type = long unsigned int]: Assertion '__n < this->size()' failed.
/usr/include/c++/11/bits/stl_vector.h:1045: std::vector<_Tp, _Alloc>::reference std::vector<_Tp, _Alloc>::operator[](std::vector<_Tp, _Alloc>::size_type) [with _Tp = gdalcubes::datetime; _Alloc = std::allocatorgdalcubes::datetime; std::vector<_Tp, _Alloc>::reference = gdalcubes::datetime&; std::vector<_Tp, _Alloc>::size_type = long unsigned int]: Assertion '__n < this->size()' failed.
[ERROR] worker process #0 returned 134
[ERROR] worker process #1 returned 134

Any idea on how to approach this or what I'm doing wrong.