text box missing keystrokes

Question

I am making a game using pygame, and I would like my user to type in a textbox when they are asked a question.

I looked this up, and came up with this code:

base_font = pygame.font.Font(None, 32)
user_text = ''
  
input_rect = pygame.Rect(A-140, B-32, 140, 32)
  
color_active = pygame.Color('lightskyblue3')
  
color_passive = (100, 100, 100)
color = color_passive
  
active = False
textbox = True
def textbox_update():
    global active
    global input_rect
    global color
    global user_text
    if not textbox:
        return
    for event in pygame.event.get():
  
        if event.type == pygame.MOUSEBUTTONDOWN:
            if input_rect.collidepoint(event.pos):
                active = True
            else:
                active = False
  
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_BACKSPACE:

                user_text = user_text[:-1]
  
            else:
                user_text += event.unicode
      
  
    if active:
        color = color_active
    else:
        color = color_passive
          
    pygame.draw.rect(screen, color, input_rect)
  
    text_surface = base_font.render(user_text, True, (255, 255, 255))
      
    screen.blit(text_surface, (input_rect.x+5, input_rect.y+5))
      
    input_rect.w = max(100, text_surface.get_width()+10)
      

    pygame.display.flip()

But this works horribly, and fails to grab input most of the time. Here is a working example I put together that shows how terrible this is:

import pygame
pygame.init()
pygame.font.init()

screen = pygame.display.set_mode((500,600))
base_font = pygame.font.Font(None, 32)
user_text = ''

input_rect = pygame.Rect(250, 300, 140, 32)

color_active = pygame.Color('lightskyblue3')

color_passive = (100, 100, 100)
color = color_passive

active = False
textbox = True
done = False

def textbox_update():
    global active
    global input_rect
    global color
    global user_text
    if not textbox:
        return
    for event in pygame.event.get():
        if event.type == pygame.MOUSEBUTTONDOWN:
            if input_rect.collidepoint(event.pos):
                active = True
            else:
                active = False
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_BACKSPACE:

                user_text = user_text[:-1]

            else:
                user_text += event.unicode
    if active:
        color = color_active
    else:
        color = color_passive

    pygame.draw.rect(screen, color, input_rect)
    text_surface = base_font.render(user_text, True, (255, 255, 255))
    screen.blit(text_surface, (input_rect.x+5, input_rect.y+5))
    input_rect.w = max(100, text_surface.get_width()+10)

    pygame.display.flip()

while not done:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            done = True
   
    screen.fill((255,255,255))
    textbox_update()
    pygame.display.update()

Why does this not work?