Looks like the connection from the southbound Adirondack to the westbound LSL that existed pre-2020 may be no more - it still arrives at SDY before the LSL, but with less than an hour to spare (and Arrow won’t let you book it). Perhaps they reads it later, though that connection was only possible in one direction anyway - you couldn’t go eastbound LSL to northbound Adirondack without staying overnight. I did use it once 12 or so years ago from Burlington, VT via the now-defunct Port Kent ferry - though these days you could just use the Ethan Allen for that trip…