Rancher CLI `up` adds volume info to resulting docker-compose config

From my windows host, I run rancher up --upgrade with docker-compose.yml and rancher-compose.yml in the local directory. Irritatingly, this operation fails because before sending the config to the remote rancher service, it adds my local windows share as a volume.

Since this unrequested addition causes my upgrade to fail, and necessitates me manually deleting and re-creating the stack each time I want to upgrade, is there a way to disable this behaviour? There’s certainly nothing in the help for it.