Questions on new tabIndex feature in 8.1.39

I was excited to use this feature and upgraded our dev gateway to play around with it. However, it seems like either it's not functioning how I expected it to, or I'm not doing something correctly.

I have the six components in the clip below (sample ID, reading 1-4 and add sample)

2024-07-01_07-52-03

The tabIndex is set to [1, 3, 2, 4, 5, 6]and you can see the tabbing follows the order correctly but the component itself gets the focus and not the field.

What am I missing?

Thanks!