Hi guys, I also faced the same problem but with Pyspark API inside unit tests, mainly the problem happens when we are building standalone spark session with support of delta extesnsion, inside pyspark this still does not work,

pyspark="3.5.3"
delta-spark="3.2.1"

for example I have fixture like this

    @pytest.mark.usefixtures("spark_session")
    def test_join_operation_with_catalog(self, spark_session: SparkSession):
        source_schema = StructType([
            StructField("id", StringType(), True),
            StructField("derived_column", StringType(), True),
            StructField("filter_column", StringType(), True)
        ])

        spark_session.sql("CREATE SCHEMA source")
        spark_session.sql("DROP TABLE IF EXISTS spark_catalog.source.source_table_join")
        spark_session.catalog.setCurrentCatalog("spark_catalog")
        spark_session.catalog.setCurrentDatabase("source")
        
        DeltaTable.createOrReplace(spark_session).tableName("source_table_join").addColumns(
                    source_schema).execute()

        try:
            print(DeltaTable.forName(spark_session, "source.source_table_join").toDF().collect())
            print('SUCCESS')
        except Exception as err:
            print("FAILURE")
            print(err)

@pytest.fixture(scope="session")
def spark_session():
    shutil.rmtree("spark-warehouse", ignore_errors=True)

    os.environ['PYSPARK_PYTHON'] = sys.executable
    os.environ['PYSPARK_DRIVER_PYTHON'] = sys.executable
    builder = (SparkSession.builder
             .master("local[*]")
             .config("spark.jars.packages", "io.delta:delta-core_2.12:2.3.0")
             .config("spark.sql.extensions", "io.delta.sql.DeltaSparkSessionExtension")
             .config("spark.databricks.delta.schema.autoMerge.enabled", "true") 
             .config("spark.sql.catalog.spark_catalog", "org.apache.spark.sql.delta.catalog.DeltaCatalog")
             .appName("test")
    )
    yield configure_spark_with_delta_pip(builder).getOrCreate()
    
    shutil.rmtree("spark-warehouse", ignore_errors=True)

 at the end it will thrown with Parsing exception like 

[PARSE_SYNTAX_ERROR] Syntax error at or near '.'.(line 1, pos 20)

== SQL ==
spark_catalog.source.source_table_join
--------------------^^^
and 

DeltaTable.createOrReplace also does not work if I use full qualified name catalog.schema.table