I think this needs to be an absolute path.
After adding an override, for example, docker-inspect shows two volumes in a container instead of one:
"Mounts": [
{
"Type": "volume",
"Name": "s4sstack_s4s-fhir-broker-vol",
"Source": "/var/lib/docker/volumes/s4sstack_s4s-fhir-broker-vol/_data",
"Destination": "/var/lib/jetty/data",
"Driver": "local",
"Mode": "rw",
"RW": true,
"Propagation": ""
},
{
"Type": "volume",
"Name": "b98929f885240332553c704a387983ef72b8b40c6d5dd369982334be648bbd6b",
"Source": "/var/lib/docker/volumes/b98929f885240332553c704a387983ef72b8b40c6d5dd369982334be648bbd6b/_data",
"Destination": "data",
"Driver": "local",
"Mode": "",
"RW": true,
"Propagation": ""
}
],