I have only shot one match (last Saturday, and it won't be my last
I was asked to "show clear" at the end of each stage. However, unless I had shot to slide-lock during the stage, all I did was a) drop the mag, b) pull open the slide to eject the chambered round and c) hold the slide open to show the RO. Then I rode the slide closed. At which point I was told to drop the hammer (by squeezing the trigger).
If shot to slide lock, I dropped the mag, showed the RO the empty chamber, and rode the slide closed. They had no problem with that.
I shoot a 1911, FWIW.