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Dear Dimitrij,
Good day! Thanks for posting in Microsoft Community. We are happy to help you.
According to your description, I have checked on my side, and I can see the list template "Travel requests". As far as I know, there are no built-in settings that can change this behavior. Based on the situation, I would like to suggest you contact your admin/IT department and let them raise a support ticket via Microsoft 365 Admin Center> Support> New service request. That support team there will have the correct channel to help you investigate more and find what exactly reason has caused this situation in the backend.
Appreciate your understanding and patience.
Sincerely,
George | Microsoft Community Moderator