Hi,
Looks like there is an issue with tooltip and rendered config in ActionColumns.
Using the provided examples in: https://www.bryntum.com/docs/grid/api/Grid/column/ActionColumn
I have created this playground: https://codepen.io/javicloud/pen/KKXWERY?editors=0010 where the tooltip is not displayed when using the rendered config.
Please have a look
Thanks
Javi