thank you for sharing your question with the Wefugees community!
The situation you described is in compliance with legislation. Even if an employer resorts to short-time work, his obligation to provide you with a proper professional training is maintained, so that you can finish your apprenticeship in time. He is also obliged to pay the normal training salary. That's the reason why you have to work your normal hours, whereas your collegues are on short-time.
Your employer also has to take care that you learn enough, so there should be an expert instructor for you or any other means that guarantee that you learn the theoretical parts of your training which are relevant for your final exams.
I hope my answers were useful for you and I'll be very pleased if you contact me again with further questions. I'm a member of the mbeon-staff and I‘ll be glad to guide over a longer period of time.
mbeon is an online advisory service for migrants via the mbeon-app, which you can download on your smartphone for free. You'll find me in the mbeon-app under my name München, Frau Müller and get confidential one-to-one advice in a safe virtual room where nobody can read messages. For further information please visit www.mbeon.de.
Download for Android: https://play.google.com/store/apps/details?id=de.zone35.mbeon
Download for iOS: https://apps.apple.com/de/app/mbeon-messengerberatung/id1408795643