It appears that in order for them to mature there have to be a specific number of zSLACK minted after yours. Just like with normal block rewards, they don't mature until more are created. So if everyone has their zSLACK automint turned off and no more is being created, then they won't mature. At least that's the way I'm understanding it.
Are we going to have to do anything to stake our SLACK when it switches to POS tomorrow? Is a wallet upgrade going to be needed? Are we going to have to type anything into the console to stake?