QDateTime::fromString(, Qt::IsoDate) accepts certain invalid input

The input where we first noticed it was something like:

QString input = "431600101".

This string is accepted and returned as QDateTime("Sat Jan 1 00:00:00 4316"). The character between the "year" (i.e. input[4] is ignored, as well as e.g. input[7]). To be a valid ISO date string those both have to be '-', and the whole string has to be one character longer.

It looks like none of the 3 format strings shown in the documentation of Qt::IsoDate is used as any of them would reject the input string.