No, we didn′t find a solution ??
Sure, we didn′t have the newest version of WordPress (5.8.4) and Woocommerce (6.1.2). But maybe the Plugin “German Market” causes the problem?
Like many other operators we can′t update our system all the time, because it′s difficult, expensive and time consuming. We just do it one time per year.
The plugin requirements are minimum WordPress 5.3 / Woocommerce 3.9. So there should be no problem for a well tested plugin.