Server constantly writes to disk at about 500kB/s

Since the release of version 1.18, the minecraft server constantly writes about 500kB/s to the disk, even if no players are currently online. I attached an iotop screenshot showing three IO-Worker threads of the java server executable, and a list of all currently open file descriptors of that process.

To me, this is an issue, because the server runs on an SSD drive, that wears down by write accesses.