QString.split missing some empty lines

Question

I'm stuck with this. I am trying to tokenize a multiline QString and count the number of lines.

QStringList sentences = m_text.split(QRegularExpression("\n|$"), Qt::SkipEmptyParts);
qDebug() << sentences.size();

In spite of the Qt::SkipEmptyParts behaviour, I keep getting 1 for a string like this, which should report 5:

Hello\n\n\n\n\n

Any Idea of what's wrong.

By the way, if the string has something at the end the count works fine:

Hello\n\n\n\n\nBye

reports 6 sentences.