Plotly Dash: Uncaught (in promise) Error after upgrading dash to 2.7.1

I have a Dash App running inside a Flask App. I am seeing a bunch of errors in the console after upgrading dash to 2.7.1

Uncaught (in promise) Error: A listener indicated an asynchronous response by returning true, but the message channel closed before a response was received


Uncaught (in promise) Error: There is already a source with this ID

at r.addSource (async-plotlyjs.js:2:1020888)
    at i.addSource (async-plotlyjs.js:2:1219363)
    at l.addSource (async-plotlyjs.js:2:2988732)
    at async-plotlyjs.js:2:2989736
    at h (async-plotlyjs.js:2:2989770)
    at l.update (async-plotlyjs.js:2:2990100)
    at b.updateData (async-plotlyjs.js:2:2338377)
    at async-plotlyjs.js:2:2336961

I do not see any errors in the application logs. What is the error? Any suggestions on where to look / troubleshoot?

from Plotly Dash: Uncaught (in promise) Error after upgrading dash to 2.7.1