TDF: bogus warnings when Snapshotting a TUUID column from multiple threads

#include <ROOT/TDataFrame.hxx>

#include <TUUID.h>

using namespace ROOT::Experimental;

int main()

{

   // write a root file containing a TUUID

   TDataFrame(1).Define("info_run", []() { return TUUID(); }).Snapshot<TUUID>("t", "test_snap.root", {"info_run"});

   ROOT::EnableImplicitMT(); // commenting eliminates the runtime warnings

   // read and write it again

   std::cout << "now snapshotting" << std::endl;

   TDataFrame("t", "test_snap.root").Snapshot<TUUID>("t", "out_snap.root", {"info_run"});

   return 0;

}