Error when using inspect.stack()

After ipykernel 6.21.0 update, the output of "inspect.stack()[1][0].f_globals" has "__file__" content that did not exist before(=ipykernel 6.20.2), causing errors when used in other methods. What is the reason and when will it be fixed?

Reproduce the reported difference between ipykernel 6.21.0 and 6.20.2 using inspect.stack()[1][0].f_globals["__file__"]. Trace where the kernel sets that frame global and compare the resulting value across versions. Done means identifying the regression and confirming a fix with a focused reproduction or test.

Scritto dal modello di indicizzazione a partire dal testo della issue.