English doesn't tolerate word-final -mb. It's always pronounced as -m, and the -b isn't pronounced when a suffix is added either.
Other examples: dumb, tomb, comb, womb, numb, thumb, catacomb, Coulomb. All of these have a silent B.
Other examples: dumb, tomb, comb, womb, numb, thumb, catacomb, Coulomb. All of these have a silent B.
And to be fair, I am aware New England English is its own distinct thing so I might have grown up in a bubble: