I just figured it out. It wasn't working for me either prior updates...it just worked. However, now it looks like you may have to enable overlay and turn TEST ON for it to work. The gems will have a negative number
There's a newer version 3.5.2. Would love to see a modded update to that. Everytime I find the 1.89.1 version im being told there's a newer version please update. Pointless to DL the mod app if it won't even let you get past the loading screen.
Was the "gems dont decrease" removed to prevent banning? It did make buying the gem powers easier. Is it possible to add a gems do not decrease to the game shop itself? There looks to be LTEs that require objects and those can be bought with gems.