Qt Creator locks up when setting breakpoint after clipboard interaction

I've got the following function where I'm trying to copy the data out of a QTableView to the clipboard in a format that will allow the resulting data to be pasted directly into an Excel spreadsheet. Here's the function:

void plotContainerWidget::slotCopyTableToClipboard()
{
 // select everything in table copy it to text string with
 // '\t' separating columns and '\n' separating rows
 if(mModel == 0)
 {
   return;
 }
 int rows = mModel->rowCount();
 int cols = mModel->columnCount();
 QString tableString;
 for(int i=0; i < cols; ++i)
 {
   tableString += mModel->headerData(i, Qt::Horizontal).toString();
   tableString += "\t";
 }
 tableString.chop(1); // remove extraneous tab
 tableString += "\n";
 for(int i=0; i < rows; ++i)
 {
   for(int j=0; j < cols; ++j)
   {
     tableString += mModel->data(mModel->index(i, j), Qt::DisplayRole).toString();
     tableString += "\t";
   }
   tableString.chop(1); // remove extraneous tab
   tableString += "\n";
 } 
 qDebug() << tableString; // string looks fine here
 QClipboard* clippy = QApplication::clipboard();
 clippy->setText(tableString);  // Qt Creator hangs on this line
 qDebug() << "copied table to clipboard";
}

When I execute this chunk of code within the debugger, it hangs at that QClipboard::setText() line. I first encountered it executing my code within the debugger, but without any breakpoints set. During that session, Qt Creator hung, and I had to force quit. After re-launching QtCreator, I set a breakpoint in this function and stepped through my code. The parsing is fine up until that line, the string looks good, but then Qt Creator hangs when that line setText() is executed. So this issue seems to happen whether I have any breakpoints set or not and interestingly this code does NOT hang when I choose "Run" from within Qt Creator, only when I choose "Start Debugging", even though that should still be executing the debug build of my application, just not running inside the debugger.

Might be related to QTBUG-67729 and QTBUG-67822