ID 501312 - Hiero 13 won't run Nuke process via PySide2 QtCore QProcess

Problem summary
Hiero 13 won't run Nuke process via PySide2 QtCore QProcess

Customer reported version
hiero.13.1v2

Customer reported platform

Steps to reproduce

1) Open Hiero 13

2) Open a heavy project, like : /mnt/netshare/support/tickets/slowProject/SlowProject_v001.hrox

3) Scrub through the timeline, to make sure files have been loaded

4) Open the Script Editor, and run the attached code, it should create a panel, then launch a background Nuke process which renders.

Note: This issue can be inconsistent, so you may need to run the code a few times to see the issue.

Expected behaviour
For the Nuke process to launch, and the output to be displayed in the Script Editor:

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Actual behaviour
Hiero sat there doing nothing and no extra Nuke process was created:

​

Workaround
Disabling the frame server can help

Reproduced by support
This bug has been reproduced in:
Hiero 13.1v2 - CentOS 7
Hiero 13.0v1 - CentOS 7 - linux regression

Unable to reproduce bug in:
Hiero 13.1v2 - Windows 10, macOS 11.6
Hiero 12.2v10 - CentOS 7

Earliest version tested
Hiero 12.2v10 - This issue doesn't appear in this version and has regressed