Does the lack of communication between processes cause issues with the pressure gradient output?

[jones-zero]

Describe the bug
I tried to output a certain component of the pressure gradient in v8.3.0, and only modified the following code:

void CFlowCompOutput::LoadVolumeData(CConfig *config, CGeometry *geometry, CSolver **solver, unsigned long iPoint){
  SetVolumeOutputValue("GRADP",     iPoint, Node_Flow->GetGradient_Primitive(iPoint, nDim+1, 1));}

void CFlowCompOutput::SetVolumeOutputFields(CConfig *config){
  AddVolumeOutput("GRADP",     "GRADP",     "SOLUTION", "GRADP");}

The results are shown in the figure, which looks like there is no communication between processes. The same issue exists in v8.2.0 and v8.5.0, but not in v7.5.1.

Bug report checklist
Please make sure that you have followed the checklist below, many common problems can be solved by:

• Consulting the build instructions (https://su2code.github.io/docs_v7/Build-SU2-Linux-MacOS/).
• Looking for similar problems on GitHub or CFD-Online (https://www.cfd-online.com/Forums/su2/).
• Updating to the newest version of SU2 (either develop, master, or the pre-built executables https://su2code.github.io/download.html).

Desktop (please complete the following information):

• Linux (Ubuntu 22.04)
• C++ compiler and version: g++ (GCC) 11.4.0
• MPI implementation and version: OpenMPI 4.1.2
• SU2 Version: v8.3.0

[pcarruscag]

Depending on your settings, SU2 does not compute the pressure gradient.

[bigfooted]

So is the question if the pressure gradient is used by the solver or not?
Or is the question how to output the pressure gradient correctly?
In any case, we cannot reproduce it, so please provide a complete testcase with a mesh and a config file.