Invalid indentation after gdformat

[graugraugrau]

I use gdformat in my project for checking before git commit. I experienced that it transformed my code to invalid code.
The following example reproduces what I have experienced.

Input:

func example_code() -> void:
	var array = [1,2,3,4,5,6,7,8,9]

	var string_array: Array[String] = []
	string_array.assign(
		(
			array.map(
				func(number_with_very_long_name: int): \
					return str(number_with_very_long_name) + "some unnecessary long string to make this bug reproducible"
			)
			as Array[int]
		)
	)

Outcome:

func example_code() -> void:
	var array = [1, 2, 3, 4, 5, 6, 7, 8, 9]

	var string_array: Array[String] = []
	string_array.assign(
		(
			array.map(
				func(number_with_very_long_name: int):
					return (
						str(number_with_very_long_name)
						+ "some unnecessary long string to make this bug reproducible"
					)
			)
			as Array[int]
		)
	)

It seems that a \ after the lambda function header would fix it.
func(number_with_very_long_name: int): \

I tried it with gdtoolkit 4.3.4 and gdtoolkit 4.3.3.