[Python] Difference in validation result using `jsonschema` and `check-jsonschema` in regard...

Given model_schema.json

{
"properties": {
"dt": {
"format": "date-time",
"title": "Dt",
"type": "string"
}
},
"required": [
"dt"
],
"title": "Model",
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema"
}


and model_instance.json

{
"dt": "2032-04-23T10:20:30"
}


Running the following Python script produces no error.

import json
from pprint import pprint

import jsonschema


with open("model_schema.json") as f:
schema = json.load(f)

with open("model_instance.json") as f:
m1_as_dict = json.load(f)


pprint(schema)
print("\n=====================================\n")
pprint(m1_as_dict)


jsonschema.validate(m1_as_dict, schema)


However, running the the following command

check-jsonschema --schemafile model_schema.json model_instance.json


produces the following error

Schema validation errors were encountered.
model_instance.json::$.dt: '2032-04-23T10:20:30' is not a 'date-time'


I think the command's behavior is correct. Why doesn't the given Python script produce a comparable error as the command?

My environment is:

check-jsonschema 0.28.2
jsonschema 4.21.1
jsonschema-specifications 2023.12.1
types-jsonschema 4.21.0.20240331

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