Fix test regression.

Author: shyuep

src/pymatgen/analysis/structure_prediction/dopant_predictor.py

@@ -81,7 +81,7 @@ def get_dopants_from_shannon_radii(bonded_structure, num_dopants=5, match_oxi_si
             - "original_species": The substituted species.
     """
     # get a list of all Species for all elements in all their common oxidation states
-    all_species = [Species(el, oxi) for el in Element for oxi in el.common_oxidation_states]
+    all_species = [Species(el.symbol, oxi) for el in Element for oxi in el.common_oxidation_states]
 
     # get a series of tuples with (coordination number, specie)
     cn_and_species = {

src/pymatgen/core/periodic_table.py

@@ -1056,6 +1056,7 @@ def __init__(
             ValueError: If oxidation state passed both in symbol string and via
                 oxidation_state kwarg.
         """
+        symbol = str(symbol)  # First ensure that any symbol is converted to a string.
         if oxidation_state is not None and symbol.endswith(("+", "-")):
             raise ValueError(
                 f"Oxidation state should be specified either in {symbol=} or as {oxidation_state=}, not both."