Nitrokey Storage 2 data loss on MacOS Ventura

after updating to MacOS Ventura, I am not able to permanently unmount the encrypted volume of a Nitrokey Storage 2. It automounts again immediately.
Hence I can’t lock it or remove it without losing alle stored data most of the times.
App-Version 1.4.0 Firmware-Version 0.5.7 MacOS 13.4
Is there any known workaround?