A lasso point in the Deep Wells (see screenshot below for location and map) allows a rope to be tied to allow access to a small otherwise inaccessible island, but the return point doesn't allow the user to climb back. The conversation appears broken at that point. Thankfully -makesafe command does get you off the little island.
Steps to reproduce the Bug:
Head to "Guldorand (Deep Wells)" (see screenshot below for location and map) and walk along the edge of the cliff until the message that there is an available spot to use your lasso appears. Use it, click on the rusty piton or stalagmite that appear, cast the rope across, then use the rusty piton to initiate conversation and climb across the gap. Once across, click on the stalagmite.
Expected Result:
Stalagmite should give similar conversation options to the piton, allow the user to climb back across the gap.
Actual Result:
The only conversation option on clicking the stalagmite is "Do Nothing [Leave.]" which leaves the user stranded on the island unless they use -makesafe.
Screenshot(s)

Additional Information/Notes