[Python] Why is the tk.Entry Widget not shown?

Why does is the Entry Widget with yellow background not shown?

import tkinter as tk

root = tk.Tk()
entryText1 = tk.Entry(root, bg='yellow')
entryText1.delete(0,tk.END)
entryText1.insert(0,'Enter Upper Threshold:')
entryText1.pack()

root.focus_force()
root.mainloop()


It exists and when i click on it, the yellow color is visible. I am using a Mac with Python 3.12.4

I played around a bit and if i just add a button afterwards, the Entry is shown correctly.

import tkinter as tk

root = tk.Tk()
entryText1 = tk.Entry(root, bg='yellow', fg="red")
entryText1.delete(0,tk.END)
entryText1.insert(0,'Enter Upper Threshold:')
entryText1.pack()

button= tk.Button(root)
button.pack()

root.focus_force()
root.mainloop()



If you put the Entry inside a Frame with a defined width and height it works again.

import tkinter as tk

root = tk.Tk()

input_frame= tk.Frame(root, width=200, height=200)
input_frame.pack()

entry = tk.Entry(input_frame, bg='yellow', fg="red") # Width of entry widget
entry.delete(0,tk.END)
entry.insert(0, 'Enter Upper Threshold:')
entry.pack()
root.focus_force()
root.mainloop()


If you create a Frame without specifying a height AND width, the Entry is not visible again.

So the real question is: Why is tkinter not consistent or what exactly am I missing. Is there a way to make the Entry visible after packing it?

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