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

I’m experiencing state management issues with st.pills when the available options change dynamically based on other user selections. The main problems are:

Double-click requirement: When something is already selected, I need to click twice on pills to toggle them

State reset: When I add new selections in a parent category that changes available options in child categories, previously selected items in child categories get reset/cleared

Use Case
I have a hierarchical selection UI:

Device Types (st.pills) → determines available Model Groups

Model Groups (st.pills) → determines available Model Numbers

Model Numbers (st.pills)

When a user selects additional device types, new model groups become available, but previously selected model groups/numbers get cleared.

Expected Behavior
Single click should toggle pill selection

When parent selections change and new options become available, previously selected items that are still valid should remain selected

Only invalid selections (no longer available) should be cleared

Reproducible Code Example

Steps To Reproduce

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Expected Behavior

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Current Behavior

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Is this a regression?

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

Debug info

• Streamlit version:
• Python version:
• Operating System:
• Browser:

Additional Information

No response