Flask displaying old / cached version of the app

[s2t2]

A handful of students are encountering an issue whereby they are developing a flask app locally, and when they make some new changes to the code and restart the local web server, it doesn't show the updated changes, but rather what appears to be an older state of the web app code.

I have confirmed they are saving the files properly and restarting the web app, and their code looks identical to mine and other students whose apps are working locally. The weird thing is the same code and usage command works for me and many other students, but not for a few of them.

See https://github.com/pallets/flask/issues/4874

Hopefully we can hear about a fix to this issue.