Summary

When using checkboxes to hide or show sections of the app, a change in the first checkbox will mess with subsequent checkboxes in terms of their display state (they lose their "checked" state if any)

Steps to reproduce

With the MWE below:

• Run the app
• Check the "Third checkbox"
• Then, check the "First checkbox"
• The "Third checkbox" reverted to unchecked, although the corresponding write is still shown

import streamlit as st

first = st.checkbox('First checkbox')
if first:
    st.write('First is checked')

second = st.checkbox('Second checkbox')
if second:
    st.write('Second is checked')

third = st.checkbox('Third checkbox')
if third:
    st.write('Third is checked')

Expected behavior:

The third checkbox should keep it's "checked" state when box 1 is clicked

Actual behavior:

The third checkbox is shown as "unchecked" even though it's value is True since the text is shown.

Is this a regression?

Not sure

Debug info

• Streamlit version: 0.56.0
• Python version: 3.7.7
• Using Conda? yes
• OS version: macOS Cataline 10.15.3
• Browser version: Chrome 80.0.3987.149