rclone: Union remote of google team drives does not work with --drive-server-side-across-configs flag

Output of rclone version

rclone v1.58.1

• os/version: ubuntu 20.04 (64 bit)
• os/kernel: 5.13.0-51-generic (x86_64)
• os/type: linux
• os/arch: amd64
• go/version: go1.17.9
• go/linking: static
• go/tags: none

Describe the issue

I and many others have noticed that if you wanted to sync a union of 2 team drives to either another google drive union mount or an individual google team drive while using the flag --drive-server-side-across-configs=true, rclone ignores the flag and downloads the files to the endpoint that calls the command and then uploads it to its destination.

Here is an example of my rclone config and the command:

rclone copy 'teamdrive-combo:TestFolder/large20GB.txt ’ TeamDriveC:clones --fast-list --transfers=16 --checkers=32 --tpslimit-burst=16 -vP --ignore-errors --stats=30s --max-backlog=2000000 --ignore-case --size-only --no-update-modtime --drive-chunk-size=256M --drive-use-trash=false --use-mmap --drive-server-side-across-configs=true --drive-stop-on-upload-limit --drive-skip-gdocs --timeout=10s --tpslimit=4

rclone config:

[teamdrive-combo] type = union upstreams = TeamDriveA: TeamDriveB:

[TeamDriveA] type = drive client_id = xxxxxxxxxxxxxxxxxxxxxxxx.apps.googleusercontent.com client_secret = xxxxxxxxxxxxxxxxxxxxxxxx scope = drive token = {“access_token”:“xxxxxxxxxxxxxxxxxxxxxxxx”,“token_type”:“Bearer”,"r>team_drive = xxxxxxxxxxxxxxxxxxxxxxxx root_folder_id =

[TeamDriveB] type = drive client_id = xxxxxxxxxxxxxxxxxxxxxxxx.apps.googleusercontent.com client_secret = xxxxxxxxxxxxxxxxxxxxxxxx scope = drive token = {“access_token”:“xxxxxxxxxxxxxxxxxxxxxxxx”,“token_type”:“Bearer”,"r>team_drive = xxxxxxxxxxxxxxxxxxxxxxxx root_folder_id =

[TeamDriveC] type = drive client_id = xxxxxxxxxxxxxxxxxxxxxxxx.apps.googleusercontent.com client_secret = xxxxxxxxxxxxxxxxxxxxxxxx scope = drive token = {“access_token”:“xxxxxxxxxxxxxxxxxxxxxxxx”,“token_type”:“Bearer”,"r>team_drive = xxxxxxxxxxxxxxxxxxxxxxxx root_folder_id =