Originally this is not a bug as hostile beggars were supposed to do away with your money. I have slightly randomized that effect.

Aha, that would explain it. And I very seldom give money to hostile beggars anyway, I don't know what spark of kindness possessed me to try it. But thieves, for example, never delete your money unless the God of Thieves takes his share, so I expected the same to be true of beggars.
Cheers,
Ben