With 12.1.35, I'm getting the following error with both set picking off and set picking false:
script ERROR: unrecognized SET PICKING SELECT parameter: false
set picking >> false <<
I've not noticed this before because as it turns out most of my set picking off commands do not matter! I finally noticed it with a situation where picking off is required.
Department of Chemistry
Illinois State University
Normal, IL 61790-4160