Only one output rendered

[sglyon]

If I run a code cell that has multiple outputs, only the first one is rendered in the output area.

To reproduce go to the thebe demo, activate the kernel, and replace the contents of the code cell with something like

print("Hello")
print("world")
print(1234)

and click run

When I do this, I get the following:

NOTE

If I click run many times, occasionally I will see all 3 outputs, but often it is just one