tqdm is completely broken

[xl0]

🐛 Bug

tqdm is very much broken in notebooks.

To Reproduce

from tqdm.auto import tqdm
from time import sleep

for _ in tqdm(range(10)):
    sleep(0.5)

Expected behavior

Renders a progress bar

Additional context

Tried in Chrome and Firefox.

[xl0]

It definitely used to work: https://www.kaggle.com/code/soheiltehranipour/tqdm-progress-bar-in-python
Here it is rendered, but if you try to run the notebook, you get the "Loading widget...".

[djherbis]

Yeah there's been a FE change that has introduced an incompatibility between the BE envs and the FE.