Can't enter decimal places for manual weights for fitness trainings in iOS app. On the website it is working

Why can't I enter decimal places for weights when creating a fitness workout in the iOS app? The “,” key is available in the app when entering weights, but it doesn't work.
However, entering weights with decimal places works on the website.
I suspect that this is a bug.

iOS 26.2
App version: 5.20.2.2