Lethality bug when changing to original GBA version

[Thousandeyes11]

When uncommenting the line:
// if uncommented lethality will work like it originally did in gba
#define ENABLE_GBA_LETHALITY
Lethality does not use the correct behavior in game. Instead of using crit/2% chance, it appears to check for a crit first, and then rolls 1/2 of skill stat, which seems consistent with what this other user also found:
https://feuniverse.us/t/editing-lethality-skill-proc-chances-in-skillsystems/24242/3

[Veslyquix]

Looking at the code, I think the logic is off:
If we crit, they have half of crit chance to use lethality.
Instead, it should be simply 50% for that case. If you have 10 crit rate, it's 0.10 * 0.05 chance to proc lethality if I'm understanding the code correctly.