The data sheet for TCA8418RTWR shows the "thermal pad" under the part but there is no mention if this pad must be a no-connect, or if it can be grounded. The examples do not show the connection at all.
The WQFN24 footprint from TI's website links to "Ultra Librarian" and it shows "EPAD" as pin 25 with 9 vias in the thermal area.
Can "EPAD" be grounded?