Checklist

• I have searched the existing issues for similar issues.
• I added a very descriptive title to this issue.
• I have provided sufficient information below to help reproduce this issue.

Summary

Hi,

Since upgrading to v1.55.0, I’ve noticed that some UI elements are appearing unexpectedly. This behavior seems to occur when a cached function is executed between the declaration of a tab and its content usage.

Here is a minimal reproducible example:

Reproducible Code Example

import time

import streamlit as st


@st.cache_data
def foo():
    time.sleep(2)


section = st.segmented_control("Section", ["S1", "S2"])

if section == "S1":
    st.markdown("- S1.1")
    st.markdown("- S1.2")
elif section == "S2":
    (tab,) = st.tabs(["S2.Tab"])
    foo()
    tab.markdown("S2 Lorem")

Steps To Reproduce

1. Click on the "S1" button
2. Click on the "S2" button

Expected Behavior

The element "- S1.2" should remain hidden.

Current Behavior

The element "- S1.2" is displayed, even though it should not be visible in this context.

Is this a regression?

• Yes, this used to work in a previous version.

Debug info

• Streamlit version: 1.55.0
• Python version: 3.14.3
• Operating System: Windows 11
• Browser: Chrome

Additional Information

No response