That's how it's packaged prior to trimming and lead forming, which looks like this:
That is an interesting look. There's an 8 bit ATMEGA like that too: https://www.microchip.com/wwwproducts/en/ATmegaS128
I wonder what that form factor with the chip suspended like that actually does for it.
Microchip these days, Atmel got acquired few years back..
The packaging looks cool of those https://www.microchip.com/wwwproducts/en/AT697F