Attaching files in notebook does not update contents

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Hello, I am running Sage 6.4.1. Using the notebook interface, attaching files does not work as the files contents are not reloaded automatically. It just shows me the previous variable values.

echo "x=2" > foo.py 
attach foo.py 
x 
2
echo "x=4" > foo.py 
x 
2

As you can see the value of x isn't updated to 4. I can confirm that attach works as intended on the terminal, just the notebook interface is broken.