This is a manifold problem. Low post-tax wages (except for some government workers), high stress due to few colleagues and tons of work, extremely late age of entry for pensions.
[1]: https://www.businessinsider.de/wirtschaft/faktencheck-robert...
[2]: https://www.tagesspiegel.de/politik/recht-auf-teilzeit-als-f...
[3]: https://www.fr.de/politik/cdu-michael-kretschmer-sachsen-rec...
[5]: https://www.sueddeutsche.de/bayern/bayern-lehrer-soeder-teil...