ChatInterface breaks from 1.6.2 to 1.6.3

When I upgrade from panel 1.6.2, my chat interface UI rendering is different and the ChatFeed area is not shown until after a message is sent. This is also true in latest version, 1.7.4.

v1.6.3 and above

v1.6.2

Are you using sizing_mode="stretch_both"

I was not using it, but adding it solved the problem - all versions now exhibit same behavior. Thanks!

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