Confirmed on a fresh build of 291, Buy/Sell tab only has UGV.
EDIT: Here's my ufoconsole.log. I'd do screenshots, but I guess I don't know what the keybind is, I can't find it in keys.cfg.
Edit2: Guess I'm blind, and I RTFM to find out
Turns out the tabs can change slightly, based upon actually clicking on disassembly then back to buy/sell.