I had another look at the hydraulic light and it's not working for me now. The dataref I was using doesn't seem to change like it used to and while I'm not sure what changed, it isn't working at the moment, mine just always stays off because the value of "CL650/lamps/integ/P4LL_hyd_cont" is always at zero (maybe certain failures trigger it, but I haven't tested everything). I asked on the HS discord and it doesn't seem there's a good place to get a status on the hydraulic system that we can use to bind to that light so I'd say just remove the mapping for now until they get some more cockpit builder integration added with an update.
It's strange your bindings don't work via the configurator but work in-sim, but I have seen that issue before as well. As long as you've got it all sorted out, that's all that matters!