If you run Intersect on these two objects and inspect the result, you will see why this type of stuff doesn’t work well. The intersection doesn’t form a complete, closed loop with which to trim. IMO, BI should just do nothing in this case.
You are not getting silence but a buggy result. I assume that you have the DeleteInput option set to Yes - the output of the command is visually identical to one of the inputs.
I’ve filed this issue at RH-65143.
Also note that your file tolerance is not the recommended one order of magnitude smaller than the smallest feature in the file…
-wim