MDDataTable sort_on method not working for first column

[javixav]

Description of the Bug

Hi kivy team, the sort_on method does not work for the first column, but works for all other columns.
The arrow does not show like in other columns

Code and Logs

from kivy.metrics import dp
from kivymd.app import MDApp
from kivymd.uix.datatables import MDDataTable
from kivymd.uix.screen import MDScreen

class BugInMDDataTable(MDApp):
    def build(self):
        self.data_tables = MDDataTable(
            column_data=[
                ("Title", dp(30), self.sort_on_title),
                ("Brand", dp(30), self.sort_on_brand),
            ],
            row_data=[
            (
                "item F",
                "brand 1",
            ),
            (
                "item A",
                "brand 2",
            ),
            (
                "item D",
                "brand 3",
            )
            ],
        
            sorted_on="Title",
            sorted_order="ASC",
            elevation=2)
        screen = MDScreen()
        screen.add_widget(self.data_tables)
        return screen

    def sort_on_title(self, data):
        return zip(*sorted(enumerate(data), key=lambda l: l[1][0]))
    def sort_on_brand(self, data):
        return zip(*sorted(enumerate(data), key=lambda l: l[1][1]))

BugInMDDataTable().run()

Versions

• OS: Windows 10
• Python: 3.11
• Kivy: 2.2.1
• KivyMD: 1.2.0