For the 2nd run, warnings.simplefilter('error')and warnings.warn() doesn't raise a warning and the program is running forever(never stops)

[hyperkai]

For the 1st run, warnings.simplefilter() with 'error' and warnings.warn() work as shown below:

import warnings

warnings.simplefilter('error')

warnings.warn("Warning 1") # UserWarning: Warning 1

But for the 2nd run, warnings.simplefilter() with 'error' and warnings.warn() doesn't raise a warning and the program is running forever(never stops) as shown below. *It doesn't occur in JupyterLab:

import warnings

warnings.simplefilter('error')

warnings.warn("Warning 1") # A warning is not shown and the program is running forever(never stops)

[cperry-goog]

What a great find, thanks. Tracking internally at b/376756650