I’ve found a workaround in the interim. If you add '*:/tag:' to the start it works. This also works with '*:/tag:*'
E.g.
system.alarm.queryStatus(source=["*:/tag:Winery/Tank Farms/White Sparkling*"],state=['ActiveUnacked'])
system.alarm.queryStatus(source=["*:/tag:*/White Sparkling*"],state=['ActiveUnacked'])