Altair Charts display issue from 0.85

Hello,
When using Streamlit Cloud in version >=0.85 (altair==4.1.0, plotly==5.3.1) some Altair visualization (especially the ones using an interactive slider) are displayed blank.
If I revert to streamlit==0.84 it works as expected.
In my local conda environment it works with any version of Streamlit.

I went through the version changelogs but couldn’t find anything related.

Any idea what could be the problem?

Link to the application: https://share.streamlit.io/mlnrt/mads-milestone1-streamlit/main/milestone1-app.py