[Python] Why is the custom tkinter placeholder text for an entry box ignored?

import tkinter as tk
import customtkinter as ui

ui.set_appearance_mode("dark")
ui.set_default_color_theme("dark-blue")

root = ui.CTk()
root.geometry("500x350")

frame = ui.CTkFrame(master=root)
frame.pack(pady=20, padx=60, fill="both", expand=True)

label = ui.CTkLabel(master=frame, text="Login System", font=("Roboto", 24))
label.pack(pady=12, padx=10)

username = tk.StringVar()
entry1 = ui.CTkEntry(master=frame, textvariable=username, placeholder_text="Username")
entry1.pack(pady=12, padx=10)

password = tk.StringVar()
entry2 = ui.CTkEntry(master=frame, textvariable=password, placeholder_text="Password", show="*")
entry2.pack(pady=12, padx=10)

def login():
print(username.get())
print(password.get())

button = ui.CTkButton(master=frame, text="Login", command=login)
button.pack(pady=12, padx=10)

checkbox = ui.CTkCheckBox(master=frame, text="Remember Me")
checkbox.pack(pady=12, padx=10)

root.mainloop()


Here is my code. The problem is that the placeholder text doesn't show up when I pass a text variable argument.

entry1 = ui.CTkEntry(master=frame, placeholder_text="Username")


shows the placeholder but doesn't pass the textvariable

entry1 = ui.CTkEntry(master=frame, textvariable=username, placeholder_text="Username")


passes the textvariable but doesn't show the placeholder

I've seen similar questions but they don't work for the custom tkinter widget and they don't use the placeholder argument.

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