Reproducible fiddle: https://jsfiddle.net/kor98cgL/
Version: 2.0.0-rc.11
Browser: both Chrome 67 and Firefox 60 (macOS 10.13.5)

When the "reset" button is clicked, the context parameter is supposed to be ctx.sortBy === 'first'; however as the fiddle shown, it is 'last'.

The presented fiddle is using async function, but the bug is persisted if provider explicitly return a promise. However, it seems normal when using synchronous provider function.

I guess this might caused by the table busy event is triggered before sortBy update event and thus blocked the provider update.