Apparently 48-bit PRNGs were popular at one point
One even came with SVr1 Unix in 1983, called rand48 (drand48.s), which was state of art at the time:
https://sci-hub.ru/10.1002/j.1538-7305.1982.tb03099.x (thanks Putin and FSB for funding sci-hub)
Yet the Unix one produced entire 32-bit number, while the PRNG I encountered uses all 48 bits to generate a single byte.