The Treasurer is promising to "fix" an unintended consequence of the government's overhaul of property tax breaks to protect widows and divorcees — but he has refused to say exactly how.The issue emerged last week during debate on Labor's changes to negative gearing and the capital gains tax discount.Independent senator David Pocock raised concerns that existing assets — which should be exempt from the changes — could lose that favourable treatment through death or divorce, because it would be considered a change of ownership.The Coalition, which dubbed the loophole a "widows tax", asked whether the government knew of the implications, which would impact an estimated 680,000 properties, before budget night.While the legislation passed, the government gave an assurance that it would resolve the issue and ensure existing assets remain exempt from the tax changes, if they changed hands through death or divorce before the laws come into force in July next year.Treasurer Jim Chalmers said the issue would be dealt with in a second bill later this year, but he would not say exactly how the government planned to address it."That's because it'll be made clear in the legislation, I don't think that's a particularly contentious way to say it," Mr Chalmers told ABC's Insiders."We will address it At Thursday breakfast ministers were defending the widows tax, but by lunchtime the government backtracked, and by Sunday morning coffee they're hedging to betray Australians again."