I had a 10-years old Philips shaver that did exactly this. My new Braun one instead works while charging, but it's probably not advertised as waterproof (even i

I had a 10-years old Philips shaver that did exactly this. My new Braun one instead works while charging, but it's probably not advertised as waterproof (even if it's mostly waterproof, or at least I've been lucky so far).