Python version

Python 3.12.7

Pymatgen version

Version: 2024.10.22

Operating system version

No response

Current behavior

Error is thrown when I try to run merge_sites.

Traceback (most recent call last):
File "", line 1, in
File "/home/yantar92/.venv/lib/python3.12/site-packages/pymatgen/core/structure.py", line 4604, in merge_sites
if props[key] is not None and self[i].properties[key] != props[key]:
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

Expected Behavior

merge_sites works without errors :)

Minimal example

import pymatgen.core as pmg
str1 = pmg.Structure.from_file('POSCAR1')
str2 = pmg.Structure.from_file('POSCAR2')
merge = str1.copy()
for site in str2:
    merge.append(site.species, site.frac_coords, properties=site.properties)
merge.merge_sites(mode='average')

Relevant files to reproduce this bug

POSCAR2.gz
POSCAR1.gz