[BUG] - Mulithread bugged for dest to source mode

[dodu94]

Describe the bug
When running in multithread the destination to source direction appears to be bugged

Additional context

Traceback (most recent call last):
  File "d:\DATA\laghida\Desktop\Launcher\SRS\New_deformed_RF\00_ExtData\new_RF_interp\interpolate.py", line 49, in <module>
    interpolator.interpolate_all()
  File "C:\ProgramData\Anaconda3\envs\dev\Lib\site-packages\interpcore\interpolator.py", line 82, in interpolate_all
    interpolated, unmapped = self.tree.interpolate(values)
                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\ProgramData\Anaconda3\envs\dev\Lib\site-packages\interpcore\dest_tree.py", line 176, in interpolate
    interpolated[offset : offset + block_size, :] = interp
    ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: could not broadcast input array from shape (63855,1) into shape (0,1)