I only fly Tengus so I haven’t tested with the other 3 T3Cs, but on 3 different accounts, my Tengu’s Salvager IIs are not showing any sign they are working besides a cycling module icon. They seem to succeed or fail on the salvaging attempt about as you’d expect for an unbonused hull using 1 each… but there’s no white beam in space (tried different graphics settings, such as shaders on high vs. low and no sign of the beam either way).
When I salvage with a Noctis, however, the beams are perfectly visible, so I’m assuming this has something to do with the July 11th T3C patch rather than anything to do with salvager modules directly.