Summary

st.balloons() was working in 1.2.0 version, but not in 1.3.0.
(The st.success text is executing all right on both versions)

Code snippet:

with st.spinner("Analyzing..."):
        pass
st.success("Done!")
st.balloons()

Is this a regression?

That is, did this use to work the way you expected in the past?
yes

Debug info

• Streamlit version: 1.3.0
• Python version: 3.9