I mounted bionic-preinstalled-server-arm64+raspi3.img.xz and confirm that .disk/info exists.
$ cat /media/bdmurray/writable/.disk/info 20200128-073319
Setting to verification-done.
I mounted bionic- preinstalled- server- arm64+raspi3. img.xz and confirm that .disk/info exists.
$ cat /media/ bdmurray/ writable/ .disk/info
20200128-073319
Setting to verification-done.