^In Rhino6 I would select the cylinder and “Ctrl + T”, then click on the cylinder in the area of the green marking to trim a hole in the circular suface.
If it has worked like that always, then yes, this can be considered a bug.
(what I find odd though, is that 2 clicks are necessary in Rhino 6/7 to trim the bigger cylinder, do you see that too?)
Okay. Ive tried to do the same trimming operation with two boxes in a similar setup. First click removes the outside surface of the upper box (which it wouldn’t have done in Rhino6)
Secon click removes the hole in the top surface of the lower cube (what I wanted)
After exiting the trimming operation with Esc, Rhino can’t shade the objects and displayes it in wired? Weird as well, I’ve only encountered that behaviour in complex trimming operations before…