Option menuSearch in fluxbox init

[Paulo Igor Barra Nascimento]

Hi folks. There's an option in fluxbox that enables some fuzzy search on 
fluxbox menu. It's enabled changing fluxbox's init in that way:
session.menuSearch: itemstart
To
session.menuSearch: somewhere
That said, it's not working on Debian 12.8, although it's working in MX Linux 
Fluxbox version which is supposed to be based on Debian Stable.
How is that possible? Aren't they the same version?