Shelly actors disappear in Homeassistant


i have round about 10 Shelly actors connected via mqtt to my HA. Today I deleted the mosquitto db. Normally this is not an issue and it is rebuild in a few seconds. All my zigbee2mqtt devices are available and some other mqtt devices as well.

Only the shelly actors are gone in HA. I can see everything in the mqtt-explorer, but no clue why HA is not detecting them. I use the shelly FW 1.08 stable.

Does anyone know why this happens? If i recover the old database from the backup, everything works again. But why does it not work, whith a blank mosquitto db?