There are some German articles that do talk about it in a bit more detail [0].
It's a mix of reasons 1) Covid grants that delayed bankruptcies, 2) Increase of VAT back to 19% for hospitality industries, 3) Increase in construction costs for construction companies, 4) inflation, 5) disruption in trade
And this is not just traditional industries, even 1 in 10 startups risk bankruptcy. [1]
That seems incredibly low though, even 10 years ago (and not specific to Germany) only 1 in 10 startups succeeded. [0]
[0] https://www.forbes.com/sites/neilpatel/2015/01/16/90-of-star...