processorAgglomerator does not work

Summary

Keyword processorAgglomerator triggers an error somewhere in List::deepCopy.

Steps to reproduce

e.g. tutorial simpleFoam/pitzDaily add in fvSolution to the solver settings for p:

    p
    {
        ..
        processorAgglomerator masterCoarsest;
    }

This will result in a error from 'deepCopy' somewhere in List.

Environment information

• OpenFOAM version : >v2106

Possible fixes

globalIndex::gather does not copy the input list anymore.