Empty results when psrecord starts a command

`psrecord --plot 0.png --interval 0.1 "python -m timeit '2 * 2'"`

[![does not work][1]][1]

There's workaround with bash which works:
`python -m timeit '2 * 2' & psrecord --plot 1.png --interval 0.1 $!`

[![works][2]][2]

[1]: https://i.stack.imgur.com/eigfA.png
[2]: https://i.stack.imgur.com/4dw3V.png

Start by reproducing the reported `psrecord --plot 0.png --interval 0.1 "python -m timeit '2 * 2'"` command and compare its behavior with the working bash workaround. Trace how psrecord launches and monitors a command; done means direct command startup produces a non-empty CPU and memory plot like the workaround.

Written by the indexing model from the issue text.