Unexpected result calculating the determinant of a singular matrix (42S)

[Thomas Okken]

But the 48G returns exactly zero regardless of whether flag -54 is set or clear...

(Free42 Binary does not return zero, so the fact that Free42 Decimal does is apparently just a coincidence, not the result of a better algorithm. There is no "tiny element is zero" cheat in play either way.)

(The HP-15C returns 2e-9 (or rather, "15C Scientific Calculator by Vicinno," on iOS, but that should be the same thing).)