@Strubbl thanks for poking me on this. It turns out this is not an issue. I was driving a car (which I hardly ever do), and it failed to route me through the tunnel, so I made a note to check. I was probably on the bike profile, because now it works fine e.g. on ORS: https://maps.openrouteservice.org/#/directions/Richard-Strauss-Stra%C3%9Fe,Munich,BY,Germany/Riedenburger%20Stra%C3%9Fe,Munich,BY,Germany/data/55,130,32,198,15,97,4,224,38,9,96,59,2,24,5,192,166,6,113,0,184,64,70,124,3,160,13,159,0,88,7,96,19,144,129,89,200,3,140,242,232,9,128,26,38,143,221,182,0,100,45,95,191,106,1,153,243,80,13,200,84,155,114,109,105,211,27,90,155,1,248,186,49,230,49,128,241,141,41,137,41,77,163,16,28,64,64,0,234,158,4,68,216,114,128,5,229,0,45,174,94,151,175,64,128,12,222,0,6,221,23,4,22,26,30,0,13,201,0,28,192,22,140,25,26,2,196,23,221,31,221,26,29,17,12,20,47,27,50,29,221,199,54,29,22,4,0,23,210,168,0,0