MemoryMax not respected in transient .scope with --user option on RHEL8

Issue

• While trying to limit maximum memory for transient scope created for non-root user to run a comand, its not being respected.

  $ systemd-run --user --scope -p MemoryHigh=0.5G -p MemorySwapMax=0 -p MemoryMax=1G  python3 /home/quickcluster/mem-test.py &
  [1] 22036
  

• Limits are set properly but OOM killer do not kill the process when it goes beyond the set limit. This is known bug in systemd on RHEL 8.

  $ systemctl --user show run-r5f1e479ed2e8453daf01c18d8fc6a041.scope | grep -i memory
  MemoryHigh=536870912
  MemoryMax=1073741824
  MemorySwapMax=0