Beginner needing help with mouse input and rotations

I have a camera which is a child of an empty object3D (called Pivot) which has a script attached so that it rotates on mouse drag. I'm just using the x coordinate of mouse click events to update the rotation of the Pivot. The rotation also lerps to a certain snapping angle (set to 90 degrees in the example). Since I'm pretty new to handling rotations and conceptualising how the position of the mouse can be transformed into a useful vector for rotation, I've gotten stuck on an issue where occasionally my rotation stalls for a second, and bounces in the other direction? Could anyone help explain why this is happening?
Here's my scene setup and code:

class_name Pivot extends Node3D

@onready var camera : Camera3D = $Camera3D

@export var snapping_angle : int = 45
@export var mouse_sensitivity : float = 2
@export var rotation_speed : float = 5
@export var current_angle : float
@export var dragging = false

var target_angle : float = 0


func _process(delta):
	current_angle = lerp_angle(rotation.y, target_angle, rotation_speed * delta)
	rotation.y = current_angle


func _input(event : InputEvent):
	if event is InputEventMouseButton and event.button_index == MOUSE_BUTTON_LEFT:
		
		if not dragging and event.is_pressed():
			dragging = true
			
		if dragging and not event.is_pressed():
			dragging = false
			
	if event is InputEventMouseMotion and dragging:
		var angle = event.position.x * mouse_sensitivity
		_update_target_angle(angle)
		
	if event.is_action_pressed("ui_left"):
		_update_target_angle(target_angle - snapping_angle)
		
	if event.is_action_pressed("ui_right"):
		_update_target_angle(target_angle + snapping_angle)


func _update_target_angle(angle : float):
	angle = roundi(angle / snapping_angle) * snapping_angle
	target_angle = deg_to_rad(-angle)