Why do breakpoints on FCEUX sometimes not work and what's an alternative method to it

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So I'm learning to write game genie codes and have successfully made a few, but ran into a weird problem with Super Mario Bros 3 (USA)

I set a breakpoint at 1736 for read, write, or execute because 1736 is where the players current Lives counter is stored, but no matter what I do (Lose a life, gain a life, reset the game, lose the game) the breakpoint never activates so I can't find where in the ROM the lives get decreased or set originally