Influx suddenly storing ON/OFF instead of 0/1

I have several grafana charts with switch states running. During one of the last updates of OHAB or INFLUX, these chats are not working any more.
After some debugging with Chronograf, i realized that INFLUX now stores the switch states as “on”/“off” strings and not as integer 1/0, as before.
I have tried to search for this behavior, but I was not able to find additional information.
I have not found any configuration parameter to change the transformation of switch states in OHAB towards influx. Any suggestions?