output container only renders two outputs

[rebornix]

This looks like a bug in VS Code, I'm seeing a lot of weird behaviors

• Basically sometimes the 2nd progress is not visible (but when i scroll or add a new cell it magically appears)
• The output Done is not displayed at the end (but when i scroll or add a new cell it magically appears)

Originally posted by @DonJayamanne in microsoft/vscode-jupyter#9397 (comment)