QString(QByteArray) constructor behavior change between Qt5 and Qt6

With Qt5, the following code will return 3, but with Qt6 it returns 6:

QString(QByteArray("foo\0\0\0", 6)).size()

The documentation of QString(QByteArray) still says this:

Stops copying at the first 0 character, otherwise copies the entire byte array.

But it looks like that's not true anymore since QByteArrayView was introduced.

QString::fromUtf8 and QString::fromLatin1 also do this, but the documentation isn't clear about the correct behavior.