Docker swarm persistent volume with rexray/dobs and mariadb fails

I am unable to mount a docker created volume with rexray/dobs into my mariadb container. It only happens with the optnami/mariadb image. i created the docker volume with:

docker volume create --name=mysql-data --opt=size=1 --driver=rexray/dobs

i do not assign the volume to a droplet via do dashboard or run the init configuration. i added the rexray/dobs plugin with:

docker plugin install rexray/dobs
DOBS_REGION=fra1
DOBS_STATUSINITIALDELAY=1000ms
DOBS_STATUSMAXATTEMPTS=100
DOBS_STATUSTIMEOUT=5m
DOBS_TOKEN=xxxx

i followed: https://github.com/rexray/rexray/issues/1321 https://medium.com/@adrian.gheorghe.dev/docker-swarm-volume-data-persistence-on-digital-ocean-with-rexray-cd418f718131

When i docker stack deploy my services i get:

“VolumeDriver.Mount: docker-legacy: Mount: mysql-data: failed: Error while waiting for storage action to finish”

and the service fails and restarts. The strange thing is that it happens only with the mariadb images - i have other images where it works