I've taken the debug logs of the sequence which puts the camera in a non-working state.

1) Start INDI and Connect: 00-connect.txt
2) Click "Preview" without and SDCard: 01-preview-nosdcard.txt
3) Change Recording Media to RAM and click again "Preview": 02-recordingmedia-sdram.txt
4) Live View on: 03-liveview-on.txt
5) Live View off: 04-liveview-off.txt
6) Click "Preview": 05-preview.txt

At this stage the camera no longer responds to capture commands, the only way to proceed is to power cycle it.

Looking at the LCD at the camera, during normal operation the LCD has the following status: IMG_2990.JPG
When Live View is ON it changes to the following status: IMG_2992.JPG
When the Live View was supposed to be OFF it keeps the following status: IMG_2992.JPG

If I do the following:

root@mos-rpi-3b-1:~# gphoto2 --shell
gphoto2: {/root} /> set-config viewfinder=1
gphoto2: {/root} /> set-config viewfinder=0