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Description of problem:
A malformed D-Bus call can hit an assert in systemd.

Version-Release number of selected component (if applicable):
systemd-249-4.el9.x86_64

How reproducible:
always

Steps to Reproduce:
1. busctl call --user \
  org.freedesktop.systemd1 \
  /org/freedesktop/systemd1 \
  org.freedesktop.systemd1.Manager \
  StartTransientUnit \
  "ssa(sv)a(sa(sv))"  \
  test.service \
  replace \
  1 ExecStart "a(sasb)" 1 /usr/bin/sleep 0 true 0
2. systemctl is-active user@$UID.service

Actual results:
systemd crashes:

systemd[61]: Assertion 'argv' failed at src/core/execute.c:5964, function exec_command_line(). Aborting.
systemd[1]: user: Main process exited, code=dumped, status=6/ABRT

Expected results:
The D-Bus call returns a validation error.

fix merged to github main branch -> https://github.com/redhat-plumbers/systemd-rhel9/pull/51