Color specified as array fails in scv.pl.scatter

[WeilerP]

Just a quick reminder so as not to forget. Will update ASAP: Specifying the argument c in scv.pl.scatter as an array when plotting gene expression on a UMAP, for example, leads to failure. The logging statement WARNING: Invalid color key. Using grey instead. is issued and only a single, grey plot is produced.

# TODO: Make reproducible example.
# `gene_names` defined as array
scv.pl.scatter(
    adata,
    basis='umap',
    c=gene_names[:20],
    cmap='viridis',
    legend_loc=None,
    colorbar=False,
    s=25,
    ncols=5
)

scv.pl.scatter(
    adata,
    basis='umap',
    c=gene_names[:20].tolist(),
    cmap='viridis',
    legend_loc=None,
    colorbar=False,
    s=25,
    ncols=5
)

Error output

# paste the error output here, if applicable

Versions

# paste the ouput of scv.logging.print_versions() here