H2O fails to run on dataset in which present ENUM field with only one unique value

[varsey]

H2O version, Operating System and Environment
ubuntu 24.04.1 LTS
h2o 3.46.0.4

Actual behavior
H2O fails to run on dataset in which present ENUM field with only one unique value.
Running simple script applying isoforest algo on sample dataset fails at predict operation resulting in vague java error

Steps to reproduce
Script to run

import h2o
h2o.init()
file_path = 'dataset.csv'
df = h2o.import_file(f'{file_path}', skipped_columns=None)
isoforest = h2o.estimators.H2OIsolationForestEstimator(seed=42)
isoforest.train(x=list(df.col_names), training_frame=df)
predictions = isoforest.predict(df)

dataset: dataset.csv

Results in the following error:

To fix an error just fill empty values in dataset with any string, like in this dataset
dataset-fixed.csv