Cannot execute as `systemd-run` unit

[stdedos]

Version info

• OS: [e.g. macOS 10.14, Windows 10, Ubuntu 18.04]
• Build: [e.g. 1062 - type "About" in the command palette]

Description

When Sublime merge is executed as

+ exec systemd-run --user --unit smerge --slice smerge.slice --property=CollectMode=inactive-or-failed --property=OOMScoreAdjust=300 --same-dir /usr/bin/smerge -- "$@"

it does not do anything. -h works, though:

$ journalctl --follow
systemd[5102]: Created slice smerge.slice - Slice /smerge.
systemd[5102]: Started smerge.service - /usr/bin/smerge --.
systemd[5102]: Started smerge.service - /usr/bin/smerge --.
systemd[5102]: Started smerge.service - /usr/bin/smerge --.
systemd[5102]: Started smerge.service - /usr/bin/smerge -- -h.
smerge[808806]: Sublime Merge build 2112
smerge[808806]: Usage: smerge path               Open the given repository
smerge[808806]:    or: smerge search query       Search for commits in the current repository
smerge[808806]:    or: smerge blame file [line]  Blame the given file in the current repository
smerge[808806]:    or: smerge log file           Show the file history in the current repository
smerge[808806]:    or: smerge mergetool          Opens the merge tool for the given files
smerge[808806]:          [--no-wait] [base] left right [-o merged]
smerge[808806]:   -n or --new-window:      Open a new window
smerge[808806]:   --launch-or-new-window:  Only open a new window if the application is running
smerge[808806]:   -b or --background:      Don't activate the application
smerge[808806]:   --safe-mode:             Launch using a sandboxed (clean) environment
smerge[808806]:   -h or --help:            Show help (this message) and exit
smerge[808806]:   -v or --version:         Show version and exit

Steps to reproduce

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Expected behavior

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Debug Information
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