dbt-fal python package failure to import catboost

Question

I don't know if this is the best way, but I trained a model outside of dbt-fal, and I want to use it to predict labels in a table using a python transformation file.

system deets:

Running with dbt=1.5.9
Registered adapter: fal=1.5.4
Registered adapter: postgres=1.5.9

fal-project.yml:

environments:
  - name: ml
    type: venv
    requirements:
      - scipy
      - pandas
      - numpy
      - statsmodels
      - catboost

catboost was just added, and the first run of the file below produced a long installation log to stdout, ending with

[builder] [info] Successfully installed [...] catboost-1.2.2 [...]

Running the python model below with dbt run select ... gives me the subsequent error

from catboost import CatBoostRegressor
from pandas import concat

def model(dbt, fal):
    dbt.config(fal_environment="ml")

    df: pandas.DataFrame = dbt.ref("tr_rep_gentrification_prediction_inputs")

    X = df\
        .drop(['col0', 'col1', 'col2'], axis=1)\
        .fillna(0.0)

    model = CatBoostRegressor()
    model.load_model('cb_model.cbm')

    pred = model.predict(X)
    results = concat([df, pred], axis=0)

    return(results)

stdout:

No module named '_catboost'
22:55:01  1 of 1 ERROR creating python table model trans.tr_rep_gentrification_prediction_outputs  [ERROR in 42.02s]
22:55:02  
22:55:02  Finished running 1 table model in 0 hours 0 minutes and 58.89 seconds (58.89s).
22:55:02  
22:55:02  Completed with 1 error and 0 warnings:
22:55:02  
22:55:02  No module named '_catboost'

At the very least the module appears to be picking up a leading underscore. Why? Or is something else wrong?

EDIT: Bizarrely, if I remove catboost from fal-project.yml and try to dbt run the file again, I get a similar error (as one would expect in this case) but no leading underscore.

No module named 'catboost'
21:53:25  1 of 1 ERROR creating python table model trans.tr_rep_gentrification_prediction_outputs  [ERROR in 30.31s]
21:53:26  
21:53:26  Finished running 1 table model in 0 hours 0 minutes and 47.16 seconds (47.16s).
21:53:26  
21:53:26  Completed with 1 error and 0 warnings:
21:53:26  
21:53:26  No module named 'catboost'