But culturally many companies operate that way. It's easy to fire someone within the first ~6 months; if you've been somewhere for awhile, you give longer than 6 weeks notice; and if you've been somewhere for awhile, you get severance.
Doesn't really have to be any simpler than that, and for further interviews it does allow you to make those expectations clear if the question is asked.
Obviously it depends on the politics of a situation, but be wary of those questions that might arise, and still leave on good terms if the new place wants to confirm you weren't let go.
This means that it's harder to get a loan or find an apartment until you're over that period. After that, you're golden.
https://allaboutberlin.com/guides/find-a-job-in-berlin#the-p...
It is not usual that people don't make it through the probationary period, but it happens. If you know 5 months into a job that it is not for you and won't work out, then search for something that does. When asked why the time at X was so short, tell the hiring manager why. A place that dings you based on your honest assessment is not a place where you will want to work anyway.