PangoSc2Nomenclature.taxonomy_tree() breaks when trying to make tree for all Pango lineages

[afmagee42]

Attempting to create a Pango tree for all lineages leads to runtime errors.

Namely, this code

import cladecombiner as cc
import polars as pl


url = "https://github.com/cov-lineages/pango-designation/raw/master/lineages.csv"
lineages = pl.read_csv(url)["lineage"].unique().to_list()

pn = cc.PangoSc2Nomenclature()
pn.setup_alias_map()

taxa = [cc.Taxon(l, is_tip=True) for l in lineages if pn.is_valid_name(l)]

tree = pn.taxonomy_tree(taxa)

produces this error

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/rzg0/git-repos/cladecombiner/cladecombiner/nomenclature.py", line 401, in taxonomy_tree
    return super().taxonomy_tree(
  File "/home/rzg0/git-repos/cladecombiner/cladecombiner/nomenclature.py", line 279, in taxonomy_tree
    raise RuntimeError(
RuntimeError: Malformed tree has multiples of tip taxa: C.1 (x2), C.3 (x2), C.2 (x2)