Tabs index out of range when appending about panel HOT 4 CLOSED

import panel as pn
pn.extension()

class Test:
    
    def __init__(self):
        self.load_button = pn.widgets.Button(name='Load Files')
        self.log_loading = pn.widgets.TextInput(name='Log for Loading')
        self.load_button.param.watch(self._load_data, 'clicks')
        self._init_layout()
        
    def _load_data(self, clicks):
        button_and_log = pn.Column(pn.widgets.Button(name='Click'), pn.widgets.TextInput(name='Txt'), name='Second')
        self.layout.append(button_and_log)
        self.append_other()
    
    def append_other(self):
        button_and_log = pn.Column(pn.widgets.TextInput(name='Txt2'), pn.widgets.Button(name='Click2'), name='Third')
        self.layout.append(button_and_log)
    
    def _init_layout(self):
        button_and_log = pn.Column(self.load_button, self.log_loading, name='First')
        self.layout = pn.Tabs(button_and_log)

t = Test()
t.layout.servable()