Mega Demonger Trick for Dungeons That Might Be Useful for Others

I thought it was a hassle to manually bring in Lord Yamawaki because Mega Demonger was being used by others, but I heard that if you use the style change skill, it won't use Mega Demonger automatically. So, I changed to Light for now, turned into a Demon Lord at 55F, and hunted bosses. Then, when I tried to proceed automatically by switching back to Light after 56F, for some reason, it unleashed Mega Demonger! I quickly force-closed the app. After restarting, the Mega Demonger button was brazenly sitting there... I think the second screenshot, showing the equipment for the style-exclusive skill, proves it's not just a simple equipment change (I'd like to know if there's a bug with the exclusive skill's generalize). The Mega Demonger button remained even in the next battle... which means auto-play is impossible if you're aiming for 60F!!! In the end, I got a really long map and switched to auto, but If I had gotten Lord Yamawaki's Thunder style, this could be a very useful trick for me, but since I don't have it, it's just an inconvenient trick that makes auto-grinding difficult. Also, let me create slots on the synthesis screen too. And when I go to create slots from my inventory, the stats aren't listed in the item list. Seriously, are the developers and operators always playing without actually playing? Let me use up my points in the subjugation point gacha all at once too～