[Python] Setting favicon for nicegui app, visible on one port but not the other

I'm trying to set a favicon for my app with following code (main):

app.mount("/static", StaticFiles(directory="static"), name="static")
ui.run(storage_secret="THIS_NEEDS_TO_BE_CHANGED", host="0.0.0.0", title="My App", favicon="static/favicon-16x16v2.ico")


I made sure favicon-16x16v2.ico is a 16x16 ico-image. And i can access the image under the adress http://127.0.0.1:8080/static/favicon-16x16.ico. However the favicon is only visible under http://localhost:8080 but not under http://127.0.0.1:8080.

Why is that and how can I make my favicon visible on the other adresses as well?

I am working on a linux system using Python 3.10. I use the Mozilla Firefox Browser for opening the app; other browsers show the same results.

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