Wrong initialization H5 writer Grid during validation

[EricMarcus-ai]

Describe the bug
During validation H5 writing, the writer is initialized with the first batch, and a grid is made here:

ahcore/ahcore/writers.py

Line 120 in 25cfc2c

grid = Grid.from_tiling(

However, during validation, we are dealing with ROIs, and the resulting coordinates may be at an arbitrary place in the WSI. This results in a misaligned grid and patches from a subsequent ROI on the same WSI may fall outside the created grid, resulting in errors here

ahcore/ahcore/writers.py

Line 245 in 25cfc2c

while not np.all(curr_coordinates == self._grid[grid_counter]):

as the correct place is never found.

To Reproduce
A train + validation run with the h5 writing enabled.

Expected behavior
It should write a h5 (slightly) around all ROIs. The correct Grid is already available in the validation dataset.