As I understand it, typically a light multi will feather with loss of oil pressure as long as the RPM is greater than that needed to cause the anti-feather latch pins to engage. If the RPM happens to be lower than the latch pin RPM threshold then the prop will be prevented from feathering because the latch pins will have engaged.
One of the checks I taught with twins during the initial failure actions (where there was a choice to try to fix the failure or feather eg in cruise) was to check if the RPM was reducing towards the anti-feather latch pin critical RPM. If RPM was reducing then skip trying to fix the failure & go straight to feather before the ability disappears.