Below the SOA for the [IXFP6N120P](https://m.littelfuse.com/~/media/electronics/datasheets/discrete_mosfets/littelfuse_discrete_mosfets_n-channel_hiperfets_ixf_6n120p_datasheet.pdf.pdf):

[![enter image description here](https://i.stack.imgur.com/AGs6w.png)](https://i.stack.imgur.com/AGs6w.png)

And the SOA for the [IRFBG30](https://www.vishay.com/docs/91124/91124.pdf):

[![enter image description here](https://i.stack.imgur.com/jLqUu.png)](https://i.stack.imgur.com/jLqUu.png)

The first one shows a DC line beyond 100 ms, but the second one does not. Does this mean the second one is unreliable beyond 10 ms, or the manufacturer decided not to put a DC line assuming the area beyond 10 ms is safe?