These securities were already pre-existing - looking back...

These securities were already pre-existing - looking back through the announcements NHEAM options were issued for example to Directors of the company as compensation for specific work done.

Looking at the amount of securities, it seems they are just transitioning NHEAM from unquoted to quoted (the numbers match exactly)

NHEAM : OPTION EXPIRING 30-JAN-2026 EX $0.20 114,692,308
New class - code to be confirmed : OPTION EXPIRING 30-JAN-2026 EX $0.20 114,692,308

In cases where new securities (such as options, convertible notes, etc.) are issued and later quoted, they will typically receive a new ASX code if they constitute a new class.